Basic Processes is a chapter in the CBSE Class 11 Biotechnology syllabus from Biotechnology. This chapter hub brings together revision notes, practice questions, worksheets, flashcards to help students learn, practice, and revise Basic Processes effectively.

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Basic Processes

NCERT Class 11 Biotechnology Chapter 7: Basic Processes (Pages 166–216)

Class 11 CBSE hub Biotechnology chapters Biotechnology

Basic Processes at a Glance

Board

CBSE

Class

Class 11

Subject

Biotechnology

Book

Biotechnology

Chapter

Pages

166–216

Resources

6 study resources

Basic Processes Revision Guide

Download the Basic Processes revision guide with key points, summaries, and quick revision notes for CBSE Class 11 Biotechnology.

Key Points

DNA as genetic material.

DNA is the primary genetic material that carries information in most organisms.

Griffith’s experiment

Demonstrated transformation using S. pneumoniae; showed DNA’s role in heredity.

Avery et al.'s conclusions

Identified DNA as the transforming principle in Griffith’s experiment; laid foundations for molecular genetics.

Hershey-Chase experiment

Used T2 bacteriophage; confirmed DNA, not protein, is genetic material.

Prokaryotic gene organization

Contains circular DNA located in the nucleoid; plasmids are also present.

Eukaryotic gene organization

DNA packaged in chromosomes, organized with histones into nucleosomes.

Semi-conservative replication

Each new DNA molecule contains one original strand and one newly synthesized strand.

Key enzymes in replication.

DNA polymerase synthesizes DNA; helicase unwinds the double helix; ligase joins fragments.

Transcription process

Generates mRNA from DNA; initiated by RNA polymerase binding to the promoter.

Translation process

Decodes mRNA into a polypeptide chain, occurring at ribosomes.

Genetic code features

Triplet codons direct amino acid assembly; 64 total codons with some being stop signals.

Mutation categories

Substitution, deletion, or addition of nucleotides leading to altered gene function.

DNA repair mechanisms

Includes excision repair and mismatch repair to correct erroneous DNA.

Lac operon model

Regulates gene expression in prokaryotes; inducible operon activated by lactose.

Positive and negative control

Negative control prevents transcription; positive control enhances transcriptional activity.

Housekeeping genes.

Constitutive genes expressed constantly for essential cellular functions.

RNA processing in eukaryotes

Includes capping, polyadenylation, and splicing before mRNA exits the nucleus.

Wobble phenomenon

Allows tRNAs to recognize multiple codons based on flexible base pairing at the third codon position.

Polyribosome formation

Multiple ribosomes translate a single mRNA simultaneously, enhancing protein production.

Central dogma of molecular biology

Describes flow of genetic information: DNA -> RNA -> Protein.

Basic Processes Practice Questions & Answers

Practice important questions and exam-style problems from Basic Processes. These questions cover key topics from the CBSE Class 11 Biotechnology syllabus.

How to practice: Start with the questions below to test your understanding of Basic Processes. Use the revision guide to review concepts you find difficult, then come back and retry the questions for better retention.

What is the primary model of DNA replication proposed by Watson and Crick?

Single Answer MCQ

Q-00068624

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Which enzyme is primarily responsible for synthesizing new DNA strands during replication?

Single Answer MCQ

Q-00068625

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During DNA replication, which base pair correctly matches according to Chargaff's rules?

Single Answer MCQ

Q-00068626

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What type of replication does the Messelson and Stahl experiment demonstrate?

Single Answer MCQ

Q-00068627

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What does DNA ligase do during DNA replication?

Single Answer MCQ

Q-00068628

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Why is an RNA primer necessary for DNA replication?

Single Answer MCQ

Q-00068629

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In which direction does DNA replication occur on the newly synthesized strand?

Single Answer MCQ

Q-00068630

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What occurs during the 'unzipping' phase of DNA replication?

Single Answer MCQ

Q-00068631

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View all 133 Basic Processes questions

Which statement about Okazaki fragments is correct?

Which mechanism ensures the accuracy of DNA replication?

What is the function of helicase during DNA replication?

What did the second generation DNA from the Messelson and Stahl experiment contain?

What structural feature differentiates RNA from DNA?

Which strand of DNA is synthesized continuously?

During DNA replication, which component helps to prevent the strands from re-annealing?

What is the primary form of genetic material found in prokaryotes?

How is prokaryotic DNA typically organized within the cell?

Which proteins are most commonly associated with eukaryotic DNA packaging?

What is a nucleosome?

Where is the genetic material located in prokaryotic cells?

What is the role of plasmids in prokaryotic cells?

Which of the following statements is true regarding eukaryotic gene organization?

How do prokaryotes compress their large DNA into a small cell?

What is the primary difference between the histones found in eukaryotes and the proteins found in prokaryotes?

During which phase of the cell cycle are nucleosomes condensed into chromosomes?

Which type of gene organization is characterized by the presence of introns and exons?

A genetic organization where most of the genes are co-transcribed into a single mRNA molecule is typical of which organism?

What aspect of eukaryotic genome organization primarily allows for gene regulation?

What kind of genetic recombination is uniquely facilitated in prokaryotes but rarely observed in eukaryotes?

Which of the following is NOT a function of plasmids in prokaryotic cells?

Who first isolated DNA from the nuclei of cells?

What is the role of DNA in organisms?

What type of DNA did Griffith use in his transformation experiments?

Which experiment provided strong evidence for DNA as genetic material?

What are Chargaff's rules related to?

In Griffith’s experiment, what transformed the non-virulent strain into a virulent one?

What is the shape of the DNA molecule?

Which type of genetic material is found in some viruses?

Which organism did Griffith primarily study in his experiments?

In the Hershey-Chase experiment, what was labeled with sulfur?

Which of the following scientists contributed to the discovery of the double helix structure of DNA?

What is the key significance of DNA being the genetic material?

Which of the following best describes the transformation principle discovered by Griffith?

Which technique was used to visualize the structure of DNA?

What role does the polysaccharide capsule play in virulent bacteria?

What is the primary function of mRNA in gene expression?

In which process is the genetic code translated into amino acids?

What is the role of RNA polymerase in transcription?

What happens to introns during RNA processing in eukaryotes?

Which part of the gene is crucial for RNA polymerase binding?

The phenomenon whereby a single mRNA is translated by multiple ribosomes concurrently is known as what?

In prokaryotes, gene expression is regulated via which of the following mechanisms?

The process that converts mRNA into a functional protein occurs in which cellular structure?

What is the significance of the 5' cap and poly-A tail in mRNA?

Which of the following best describes the genetic code?

What type of mutation involves a single nucleotide change?

What is the role of the lac operon in E. coli?

Reverse transcription is primarily associated with which type of virus?

What is the minimum number of nucleotides required to encode a single amino acid?

Which of the following statements about the genetic code is TRUE?

What role does the 'start codon' AUG play in protein synthesis?

How many total codons are possible in the genetic code?

Which of the following amino acids does the codon AAA specify?

The process of translation occurs in which part of the cell?

What is the significance of the poly-A tail in mRNA?

During translation, what determines which tRNA binds to the mRNA?

What is the starting amino acid in the translation process?

What is splicing in the context of mRNA processing?

In which part of the ribosome does the tRNA carrying the growing polypeptide chain bind?

Which scientist is credited with deciphering the first codon?

What enzyme catalyzes the formation of peptide bonds during translation?

Why does a single tRNA molecule often recognize more than one codon?

What must occur before translation begins in both prokaryotes and eukaryotes?

Which of the following is NOT a characteristic of the genetic code?

Which site in the ribosome is responsible for the exit of the uncharged tRNA?

The degeneracy of the genetic code refers to?

During termination of translation, what signals the end of polypeptide synthesis?

Which of the following accurately describes the Shine-Dalgarno sequence?

What happens during the termination stage of translation?

What is the role of release factors in translation termination?

In prokaryotic translation, where does the assembly of the ribosome begin?

Which factor is essential for the elongation phase of translation?

What is the consequence of having multiple ribosomes translating the same mRNA simultaneously?

How does the structure of eukaryotic mRNA differ from that of prokaryotic mRNA?

What mechanism assures that only specific aminoacyl-tRNA enters the A site?

Which of the following statements is true regarding the peptide bond formation?

What is the primary function of DNA repair mechanisms?

Which type of DNA repair removes damaged bases by identifying and excising them?

What triggers the mechanism of Nucleotide Excision Repair (NER)?

Which protein complex is involved in the initial identification of DNA damage in NER?

During Base Excision Repair, what does DNA glycosylase do?

Which type of mutation is repaired by Mismatch Repair (MMR)?

What is the primary role of DNA ligase in DNA repair processes?

In the Mismatch Repair mechanism, what do proteins MutH, MutL, and MutS do?

What is the main disadvantage of not having effective DNA repair mechanisms?

What is the significance of the AP site in DNA repair?

How does the presence of pyrimidine dimers affect DNA structure?

Which type of DNA repair is often utilized for correcting errors during DNA synthesis in eukaryotes?

In which DNA repair mechanism is a section of the damaged DNA strand removed?

What specific type of damage does oxidative stress typically cause to DNA?

Which DNA repair mechanism is primarily responsible for repairing large, bulky DNA adducts?

What is a gene mutation?

Which of the following is an example of point mutation?

What type of mutation alters the reading frame of the genetic code?

Which agent is considered a mutagen?

Sickle cell anaemia is a result of which type of mutation?

What is the primary effect of a frameshift mutation?

Which of the following describes a transition mutation?

What can be a consequence of a deletion mutation?

Which of the following statements is true regarding mutations?

Which type of mutation causes no change in the encoded amino acid?

If a single base is deleted from a DNA sequence, what will be the likely effect?

What role do repair enzymes play in relation to mutations?

How can environmental factors induce mutations?

A mutation that results in the formation of a stop codon from a codon encoding an amino acid is called what?

What type of mutation involves the exchange of a purine with a pyrimidine?

What is often the consequence of a frameshift mutation on the protein produced?

What is the primary mechanism of gene regulation in prokaryotes?

Which of the following is a characteristic of constitutive genes?

In the lac operon, what role does the presence of lactose play?

What term describes the mechanism by which gene expression is turned on or off?

Which enzyme is crucial for the initiation of transcription in eukaryotes?

What is the role of a promoter in gene expression?

During gene regulation, what is usually the role of the repressor?

How do environmental changes affect gene expression in bacteria?

What type of regulation involves the modification of mRNA after transcription?

Which type of molecule can enhance gene expression by binding to specific DNA sequences?

What is the function of enhancers in gene expression?

Which process removes introns from the primary RNA transcript?

What is an operon?

Which of the following best describes regulated gene expression?

What is RNA interference (RNAi)?

What is the role of chromatin remodeling in gene regulation?

Single Answer MCQ

Q-00068786

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Basic Processes Practice Worksheets

Download and practice Basic Processes worksheets to improve problem-solving accuracy and speed for CBSE Class 11 Biotechnology exams.

Basic Processes - Practice Worksheet

This worksheet covers essential long-answer questions to help you build confidence in Basic Processes from Biotechnology for Class 11 (Biotechnology).

Practice

Questions

Explain the concept of DNA as the genetic material, including its characteristics and the evidence supporting this idea.

DNA is the molecule that carries genetic information in living organisms. It is composed of nucleotides and exhibits specific properties like stability, replication ability, and capacity to evolve. Historical experiments including Griffith's transformation experiment and the Hershey-Chase experiment provided substantial evidence supporting DNA's role as genetic material. In Griffith's experiment, non-virulent bacteria transformed into virulent forms by taking up DNA from heat-killed virulent bacteria. Meanwhile, in the Hershey-Chase experiment, radioactive labeling of DNA and protein showed that only DNA entered bacterial cells, confirming its role in inheritance.

Discuss the organization of genes in prokaryotes and how it differs from that in eukaryotes.

Prokaryotic gene organization is simpler; their genes are located on a single circular DNA molecule in a region called the nucleoid and can be arranged in operons, which allows coordinated expression. Eukaryotes have multiple linear chromosomes within a membrane-bound nucleus. Their genes are often split into exons and introns, requiring complex processing like splicing. Regulatory sequences are more complex in eukaryotes and include enhancers and silencers that affect gene expression.

Outline the process of DNA replication, including the roles of various enzymes and the significance of each step.

DNA replication is a semi-conservative process that involves several steps: initiation, elongation, and termination. DNA helicase unwinds the double helix, creating replication forks. Primase synthesizes short RNA primers to initiate replication. DNA polymerase then adds nucleotides in the 5' to 3' direction, creating leading and lagging strands. Okazaki fragments are joined by DNA ligase. This process ensures accurate duplication of genetic material for cell division.

Explain the central dogma of molecular biology and the processes of transcription and translation.

The central dogma states that genetic information flows from DNA to RNA (transcription) and then to protein (translation). During transcription, RNA polymerase synthesizes mRNA from the DNA template by recognizing promoter sequences. In translation, the mRNA is read by ribosomes, tRNA brings specific amino acids, and polypeptides are formed. The sequence of mRNA codons determines the order of amino acids, which ultimately dictates protein structure and function.

Describe the features of the genetic code and its significance in protein synthesis.

The genetic code consists of triplet codons, where each codon corresponds to a specific amino acid. There are 64 codons, with 61 coding for amino acids and three serving as stop signals. The genetic code is degenerate (multiple codons for one amino acid) and unambiguous (each codon specifies only one amino acid). This redundancy helps mitigate the effects of mutations and ensures efficient protein synthesis.

What are gene mutations? Discuss types of mutations and their potential effects on gene function.

Gene mutations are changes in the nucleotide sequence of DNA. They include point mutations (substitutions) and frameshift mutations (insertions or deletions). Point mutations can lead to silent, missense, or nonsense mutations, altering amino acid sequences in proteins. Frameshift mutations disrupt reading frames, often resulting in entirely different and nonfunctional proteins. The impact of mutations can be beneficial, neutral, or detrimental, influencing evolutionary processes.

Discuss the mechanisms of DNA repair and their importance in maintaining genetic stability.

DNA repair mechanisms, including base excision repair (BER) and nucleotide excision repair (NER), are crucial for fixing DNA damage caused by environmental factors or replication errors. BER targets specific damaged bases, while NER removes larger sections of DNA around distortions like UV-induced dimers. These repair processes ensure the integrity and stability of genetic information, preventing mutations that could lead to diseases such as cancer.

Explain the regulation of gene expression in prokaryotes using the lac operon as an example.

The lac operon in E. coli is a classic example of gene regulation in prokaryotes. It contains genes required for lactose metabolism and is regulated by a repressor protein that prevents transcription in the absence of lactose. When lactose is available, it converts to allolactose, binding to the repressor, inactivating it, and allowing transcription. This ensures that the resources are used efficiently and only required genes are expressed.

Describe the outcome of the Hershey-Chase experiment and its implications for the understanding of genetic material.

The Hershey-Chase experiment demonstrated that DNA, not protein, is the genetic material. By using T2 bacteriophage, they showed that only the radioactive DNA entered the bacterial cells, while the protein coat remained outside. This experiment provided strong evidence that genetic information is stored in DNA and laid the foundation for molecular genetics, confirming DNA's role in heredity.

Basic Processes - Mastery Worksheet

This worksheet challenges you with deeper, multi-concept long-answer questions from Basic Processes to prepare for higher-weightage questions in Class 11.

Mastery

Questions

Discuss the role of DNA as the genetic material using Griffith's and Avery's experiments as evidence. How do these findings support the central dogma of molecular biology?

DNA is established as the heritable material by showing that heat-killed virulent strains can transform non-virulent strains into virulent ones. Griffith’s experiment demonstrated transformation, which was later shown by Avery, McCarty, and MacLeod to be due to DNA, confirming that DNA carries genetic information. This supports the central dogma that DNA is transcribed to RNA and translated to protein.

Compare and contrast the organization of genes in prokaryotes and eukaryotes. Discuss how this organization impacts gene expression.

Prokaryotic genes are often arranged in operons, allowing coordinated expression, while eukaryotic genes are usually split by introns and regulatory sequences, allowing for complex regulation via splicing and modifications. This difference impacts how quickly genes can be expressed and regulated in response to environmental changes.

Explain the semi-conservative mechanism of DNA replication, detailing the roles of different enzymes and the direction of synthesis.

In semi-conservative replication, each parental strand serves as a template for a new strand. DNA helicase unwinds the DNA, DNA polymerase synthesizes new strands in a 5' to 3' direction, and primase lays down RNA primers. DNA ligase then joins Okazaki fragments on the lagging strand.

Describe the process of transcription in eukaryotes, emphasizing the role of different RNA polymerases and post-transcriptional modifications.

Eukaryotic transcription involves RNA polymerase II for mRNA synthesis. The process includes initiation at a promoter, elongation of RNA strands, and termination at a terminator site. Post-transcriptional modifications include 5' capping, polyadenylation, and splicing, which processes the primary transcript into mature mRNA.

Discuss how mutations can occur and the mechanisms by which they can be repaired. Include examples of specific types of mutations.

Mutations may arise from errors in DNA replication or external factors (mutagens). They can be classified into point mutations (substitutions) and frameshift mutations (insertions and deletions). Repair mechanisms include base excision repair (BER) and nucleotide excision repair (NER), which rectify these errors to maintain genetic integrity.

Define the genetic code and explain its characteristics. How does this code guide protein synthesis?

The genetic code is a set of rules that specifies how sequences of nucleotides in mRNA correspond to amino acids in proteins. Characteristics include being triplet codons, unambiguous, degenerate, and universal. This code is used during translation where ribosomes translate mRNA into polypeptides based on codon-anticodon pairing.

Analyze the regulation of gene expression in prokaryotes, focusing on the lac operon as a case study.

The lac operon exemplifies gene regulation through negative feedback. In absence of lactose, the repressor binds to the operator preventing transcription. When lactose is present, it converts to allolactose, inactivating the repressor, allowing RNA polymerase to transcribe genes coding for enzymes needed to metabolize lactose.

Explain the significance of post-transcriptional modifications in eukaryotic gene expression.

Post-transcriptional modifications such as capping, splicing, and polyadenylation are crucial in eukaryotic gene expression as they enhance mRNA stability, facilitate export from the nucleus, and ensure correct translation. These modifications are essential for the functional maturity of the mRNA.

Discuss how environmental factors can affect mutation rates in organisms, providing examples of such factors.

Environmental factors such as UV irradiation and chemical agents can increase mutation rates by damaging DNA. For instance, UV light can cause thymine dimers, leading to errors during replication if not repaired, resulting in mutations.

Illustrate the difference between constitutive and inducible gene expression and provide examples of each.

Constitutive expression refers to genes that are continually expressed for basic life functions, like housekeeping genes. Inducible genes, such as those in the lac operon, are expressed only under certain conditions (i.e., lactose presence). This is important for metabolic efficiency.

Basic Processes - Challenge Worksheet

The final worksheet presents challenging long-answer questions that test your depth of understanding and exam-readiness for Basic Processes in Class 11.

Challenge

Questions

Discuss the implications of the Hershey-Chase experiment in the context of understanding DNA as the genetic material. Evaluate its contributions and limitations.

Consider how the experimental design provided clarity on the role of DNA versus protein, while acknowledging areas of uncertainty in genetic material identity.

Analyze the significance of Griffith's transformation experiment for the concept of gene transfer. In what ways did it pave the way for future genetic research?

Discuss how the findings influenced the acceptance of DNA as the hereditary material and how it stimulated further investigation into genetic mechanisms.

Evaluate the advantages and challenges of using eukaryotic gene expression in biotechnology applications compared to prokaryotic expression systems.

Provide perspectives on yield, post-translational modifications, and complexity of gene regulation in both systems.

Critique the molecular mechanisms underpinning DNA repair processes, especially focusing on the roles of specific enzymes in mismatch and nucleotide excision repair.

Detail how these processes safeguard genetic integrity and their implications for mutagenesis.

In a scenario where a point mutation occurs, analyze how gene expression might be altered. Discuss potential outcomes for phenotypic variation.

Explore specific examples, such as silent, missense, and nonsense mutations, and their effects on protein function.

Synthesize information on how transcription factors influence gene expression in eukaryotes. Examine case studies that illustrate their importance.

Evaluate examples of specific transcription factors and their roles in cellular differentiation or disease states.

Appraise the nature of the genetic code by discussing its triplet nature and universality. How does this facilitate protein synthesis across different life forms?

Discuss the implications for genetics, evolution, and biotechnology.

Examine the role of operons in prokaryotic gene regulation. Using the lac operon as a model, discuss how environmental signals affect gene expression.

Detail the mechanisms of positive and negative feedback in gene regulation.

Evaluate the impact of ionizing radiation on DNA structure. Discuss the biological pathways that mitigate damage and the implications for cellular health.

Address the balance between mutation rates and repair efficacy in relation to cancer biology or genomic stability.

Analyze the processes of DNA replication in both prokaryotes and eukaryotes, focusing on the leading and lagging strands. What are the implications of errors during replication?

Discuss error correction mechanisms and their importance in maintaining genomic fidelity.

Basic Processes Frequently Asked Questions

Explore the critical concepts of DNA as genetic material, gene organization, replication, and expression in this comprehensive chapter from the Class 11 Biotechnology curriculum.

QWhat is the significance of DNA in genetic inheritance?

DNA carries the genetic information that determines the traits or characteristics inherited from parents to offspring. It is the primary material responsible for encoding genes, which instruct cells on how to produce proteins, ultimately influencing the organism's development and function.

QWho first isolated DNA, and why is it significant?

Johann Friedrich Miescher first isolated DNA from pus cells in 1869. This discovery was significant as it led to the understanding of DNA's role as genetic material, paving the way for further research into genetics and molecular biology.

QWhat was Frederick Griffith's experiment, and what did it demonstrate?

Frederick Griffith's 1928 experiment with Streptococcus pneumoniae demonstrated the phenomenon of transformation, where harmless bacteria (R strain) changed into virulent bacteria (S strain) when exposed to heat-killed S strain, indicating that some genetic material was transferred.

QHow did the Avery-Macleod-McCarty experiment affirm DNA as genetic material?

The Avery-Macleod-McCarty experiment involved treating extracts from the heat-killed virulent strain with enzymes that destroyed proteins, RNA, and DNA. Transformation only occurred when DNA was intact, confirming that DNA is the substance that carries genetic information.

QWhat are the key differences in gene organization between prokaryotes and eukaryotes?

Prokaryotes typically have a single circular DNA molecule located in the nucleoid region, while eukaryotes possess linear DNA organized into multiple chromosomes within a membrane-bound nucleus, with complex packaging involving histones and nucleosomes.

QWhat does semiconservative replication mean?

Semiconservative replication refers to the process during DNA replication where each new DNA molecule consists of one parental strand and one newly synthesized strand, ensuring that genetic information is accurately passed on to daughter cells.

QCan you explain the central dogma of molecular biology?

The central dogma of molecular biology describes the flow of genetic information: DNA is transcribed into mRNA, which is then translated at ribosomes to produce proteins. This process is critical for expressing genes and enabling cellular functions.

QWhat is the role of RNA polymerase in transcription?

RNA polymerase is the enzyme responsible for synthesizing RNA from a DNA template during transcription. It binds to the promoter region, unwinds the DNA, and catalyzes the formation of mRNA, which carries genetic information for protein synthesis.

QWhat are codons and their function?

Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids during protein synthesis. Each codon directs the incorporation of a particular amino acid into a growing polypeptide chain.

QHow do mutations occur, and what are their types?

Mutations can occur spontaneously during DNA replication or be induced by external factors like radiation or chemicals. They can be classified as point mutations (substitutions), insertion, or deletion mutations that change the nucleotide sequence in DNA.

QWhat is the lac operon, and how is it regulated?

The lac operon is a group of genes in E. coli that encode proteins for lactose metabolism. It is regulated by a repressor that inhibits transcription in the absence of lactose and is activated when lactose is present, allowing gene expression.

QWhat is the significance of post-transcriptional modifications in eukaryotes?

Post-transcriptional modifications like capping, splicing, and polyadenylation are crucial for mRNA stability, translation efficiency, and the removal of non-coding introns, ensuring that only coding sequences (exons) are expressed in proteins.

QWhat is the difference between leading and lagging strands during DNA replication?

The leading strand is synthesized continuously in the 5' to 3' direction towards the replication fork, while the lagging strand is synthesized discontinuously in short segments called Okazaki fragments, which are later joined together.

QWhat mechanisms do cells use to repair DNA?

Cells utilize various DNA repair mechanisms including base excision repair, nucleotide excision repair, and mismatch repair, which help correct errors and maintain the integrity of genetic information throughout various cellular processes.

QHow do physical agents induce mutations in DNA?

Physical agents, such as UV and ionizing radiation, can cause DNA damage by creating thymine dimers or causing strand breaks, leading to errors during replication that can result in mutations if not repaired effectively.

QWhat is meant by the genetic code being degenerate?

The genetic code is termed degenerate because multiple codons can specify the same amino acid. For example, multiple codons encode for leucine, allowing for some variability without altering the resulting protein.

QWhat is the role of introns and exons in eukaryotic genes?

In eukaryotic genes, exons are coding sequences that appear in the final mRNA, while introns are non-coding segments that are removed during RNA processing. This splicing allows for the production of different protein variants from a single gene.

QHow does the presence of allolactose influence the lac operon?

Allolactose acts as an inducer for the lac operon. When it binds to the repressor, it causes a conformational change that inactivates the repressor, allowing transcription of the lac operon genes for lactose metabolism.

QWhat are the end products of translation, and how are they formed?

Translation produces polypeptides or proteins, which are formed by linking amino acids together in the order specified by the mRNA codons. This process occurs at ribosomes and requires mRNA, tRNA, and various ribosomal proteins.

QWhat defines an operon in prokaryotic cells?

An operon is a cluster of functionally related genes located on a prokaryotic chromosome that are transcribed together into a single mRNA molecule. It typically includes structural genes, a promoter, and an operator for regulation.

QWhat is a polyribosome, and why is it important?

A polyribosome is a complex formed when multiple ribosomes simultaneously translate a single mRNA strand. This allows for the rapid and efficient production of multiple copies of a polypeptide from one mRNA, enhancing gene expression.

QWhat is peptidyl transferase and its function?

Peptidyl transferase is the enzymatic activity of the ribosome that catalyzes the formation of peptide bonds between adjacent amino acids during protein synthesis. It plays a critical role in elongating the growing polypeptide chain.

QHow does DNA polymerase I function during replication?

DNA polymerase I has several functions during DNA replication, including removing RNA primers from Okazaki fragments and replacing them with DNA nucleotides. It also participates in DNA repair and maintains the fidelity of replication.

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Basic Processes Flashcards

Revise key terms and definitions from Basic Processes with interactive flashcards. Quick recall practice for CBSE Class 11 Biotechnology.

These flash cards cover important concepts from Basic Processes in Biotechnology for Class 11 (Biotechnology).

1/20

What is DNA?

1/20

DNA (Deoxyribonucleic Acid) is the molecule that carries genetic information crucial for the development and functioning of organisms.

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2/20

What defines the transforming principle discovered by Griffith?

2/20

The transforming principle is DNA, which can transfer genetic traits from dead bacteria to live bacteria, transforming them into virulent forms.

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3/20

State the semi-conservative nature of DNA replication.

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3/20

In semi-conservative replication, each new DNA molecule consists of one original strand and one newly synthesized strand.

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4/20

Who confirmed DNA as the transforming principle?

4/20

Oswald T. Avery, Colin Macleod, and Maclyn McCarty established that DNA is the transforming principle through their experiments.

5/20

What is the function of DNA polymerase III?

5/20

DNA polymerase III is the primary enzyme involved in synthesizing new DNA strands during replication, operating in the 5' to 3' direction.

6/20

Explain the role of operons in prokaryotes.

6/20

Operons are clusters of genes under the control of a single promoter, allowing coordinated regulation of gene expression in prokaryotes.

7/20

What is the genetic code?

7/20

The genetic code is a set of rules that determines how sequences of nucleotides translate into amino acids, using codons consisting of three nucleotides.

8/20

Describe transcription.

8/20

Transcription is the process where RNA is synthesized from a DNA template, producing mRNA which carries genetic information to the cytoplasm.

9/20

What is a mutation?

9/20

A mutation is a change in the DNA sequence that may lead to altered traits; it can be caused by errors in replication or external factors.

10/20

Identify the main types of DNA repair mechanisms.

10/20

Key types of DNA repair mechanisms include base excision repair, nucleotide excision repair, and mismatch repair.

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What are plasmids?

11/20

Plasmids are small, circular pieces of DNA found in prokaryotic cells that can replicate independently of chromosomal DNA; they are often involved in gene transfer.

12/20

What does the term 'genome' refer to?

12/20

The genome is the complete set of genetic material in an organism, including both nuclear and organelle DNA.

13/20

What is the central dogma of molecular biology?

13/20

The central dogma describes the flow of genetic information from DNA to RNA (transcription) and from RNA to protein (translation).

14/20

How do eukaryotes process mRNA?

14/20

Eukaryotic mRNA processing includes capping, splicing to remove introns, and polyadenylation before translation.

15/20

Explain the role of tRNA in translation.

15/20

tRNA (transfer RNA) brings amino acids to the ribosome, matching its anticodon with the mRNA codon, facilitating polypeptide synthesis.

16/20

What is the significance of the Hershey-Chase experiment?

16/20

The Hershey-Chase experiment provided evidence that DNA, not protein, is the genetic material by tracking radioactive labels in bacteriophages.

17/20

Define genetic expression.

17/20

Gene expression is the process through which the information encoded in a gene is translated into a functional gene product, usually proteins.

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What is the difference between prokaryotic and eukaryotic gene organization?

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Prokaryotic genes are often arranged in operons without introns, while eukaryotic genes typically have a more complex structure with exons and introns.

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What is a codon?

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A codon is a sequence of three nucleotides in mRNA that specifies a particular amino acid or a stop signal during protein synthesis.

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List types of mutations.

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Mutations can be classified into substitutions, insertions, and deletions, each affecting the DNA sequence in different ways.

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