This chapter explains basic processes of biotechnology including DNA replication, gene expression, and gene regulation. Understanding these processes is crucial for grasping how traits are inherited and expressed in organisms.
Basic Processes - Quick Look Revision Guide
Your 1-page summary of the most exam-relevant takeaways from Biotechnology.
This compact guide covers 20 must-know concepts from Basic Processes aligned with Class 11 preparation for Biotechnology. Ideal for last-minute revision or daily review.
Complete study summary
Essential formulas, key terms, and important concepts for quick reference and revision.
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.
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