Host-Vector System is a chapter in the CBSE Class 12 Biotechnology syllabus from Biotechnology. This chapter hub brings together revision notes, practice questions, worksheets, flashcards to help students learn, practice, and revise Host-Vector System effectively.

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Host-Vector System

NCERT Class 12 Biotechnology Chapter 2: Host-Vector System (Pages 9–26)

Class 12 CBSE hub Biotechnology chapters Biotechnology

Host-Vector System at a Glance

Board

CBSE

Class

Class 12

Subject

Biotechnology

Book

Biotechnology

Chapter

Pages

9–26

Resources

6 study resources

Host-Vector System Revision Guide

Download the Host-Vector System revision guide with key points, summaries, and quick revision notes for CBSE Class 12 Biotechnology.

Key Points

Recombinant DNA (rDNA) technology basics.

rDNA technology joins two DNA molecules to isolate and manipulate genes for various applications.

Key components of rDNA technology.

It involves a compatible host organism and a vector, crucial for gene cloning.

Define host in gene cloning.

A host must allow rDNA entry, replicate it, and provide required enzymes for smooth operation.

E. coli as a prokaryotic host.

E. coli is commonly used due to rapid growth and easy manipulation for gene cloning.

Types of vectors: plasmids.

Plasmids are circular, double-stranded DNA capable of autonomous replication, crucial in cloning.

Characteristics of a good vector.

Vectors should have an origin of replication, unique restriction sites, and a selectable marker.

Features of plasmids as vectors.

They should be small, integrate large inserts, and have selectable markers like antibiotic resistance.

Lambda (λ) phage as a vector.

A bacteriophage used for cloning, efficient at packaging and cloning larger DNA inserts.

Insertion vs Replacement vectors.

Insertion vectors have a single site for DNA insertion; replacement vectors replace segments of phage DNA.

M13 bacteriophage characteristics.

M13 possesses a single-stranded circular DNA, ideal for cloning smaller inserts with blue/white screening.

Cosmids in gene cloning.

Hybrid vectors combining plasmid and λ phage features, accommodating inserts up to 45 kb.

Role of phasmids.

Hybrids of plasmids and phage, able to replicate in both forms, useful for certain cloning strategies.

Understanding YACs.

Yeast Artificial Chromosomes can host large DNA inserts (200-500 kb), essential for eukaryotic cloning.

Shuttle vectors explained.

Developed for replication in multiple hosts, combining features from prokaryotic and eukaryotic systems.

Expression vectors function.

Designed to express cloned genes efficiently, containing necessary promoter and terminator sequences.

Heterologous gene expression issues.

Requires that eukaryotic genes lack introns, ensuring compatibility with prokaryotic hosts.

Importance of selectable markers.

Essential for identifying successful recombinant clones during gene cloning processes.

Role of DNA insert in vectors.

Inserts are pivotal for defining the function of the vector in producing desired proteins or traits.

Applications of rDNA technology.

Used in medicine (like insulin), agriculture (GM crops), and research for gene function studies.

Cloning large DNA fragments.

Requires specialized vectors such as YACs or BACs due to size constraints of standard plasmids.

Host-Vector System Practice Questions & Answers

Practice important questions and exam-style problems from Host-Vector System. These questions cover key topics from the CBSE Class 12 Biotechnology syllabus.

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

What are the two key components of recombinant DNA technology?

Single Answer MCQ

Q-00095848

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Which of the following is the most commonly used prokaryotic host for gene cloning?

Single Answer MCQ

Q-00095849

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What is the primary function of a vector in recombinant DNA technology?

Single Answer MCQ

Q-00095850

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Which of the following features is NOT typical of a good vector?

Single Answer MCQ

Q-00095851

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What type of host is yeast when used in recombinant DNA technology?

Single Answer MCQ

Q-00095852

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What is the role of restriction enzymes in recombinant DNA technology?

Single Answer MCQ

Q-00095853

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Which vector is specifically designed for the expression of proteins in a host?

Single Answer MCQ

Q-00095854

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Why is plasmid considered a popular vector for gene cloning?

Single Answer MCQ

Q-00095855

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View all 89 Host-Vector System questions

What characteristic of E. coli makes it suitable for cloning?

Which of the following vectors can be used in both prokaryotic and eukaryotic systems?

Which of the following statements best describes a capability required of a host in recombinant DNA technology?

What is a major advantage of using Bacillus subtilis as a host?

What factor does a vector's 'origin of replication' provide?

Why must a host not degrade recombinant DNA?

What is an expression vector primarily designed for?

What are R-plasmids primarily known for?

Which structure is formed by plasmid transfer genes to connect to other bacterial cells?

What is the main characteristic of high copy plasmids?

Col plasmids are primarily responsible for the production of which of the following?

What type of vector is characterized by having features of both plasmids and lambda phage vectors?

During the life cycle of the M13 bacteriophage, what is the double-stranded replicative form (RF) primarily used for?

Which of the following statements about episomes is true?

What aspect of a vector is important for screening transformed cells?

Which of the following is NOT a common feature of vectors used in genetic engineering?

What defines a low copy plasmid?

Why are plasmids considered useful tools in biotechnological applications?

Which mechanism is NOT used by F-plasmids to transfer genetic material?

Why is it essential for vectors to have an origin of replication?

When producing a recombinant plasmid, why is it necessary to use restriction enzymes?

Which characteristic is often associated with the plasmids that carry toxin genes?

What is the role of selectable markers in vectors?

What is the primary function of a vector in recombinant DNA technology?

Which of the following is a characteristic of plasmid vectors?

Which type of vector is specifically designed for the expression of cloned genes?

Which of the following is a key advantage of using a bacteriophage as a vector?

In recombinant DNA technology, what is the purpose of a selectable marker within a vector?

What type of vector combines features of plasmids and bacteriophages?

What characteristic distinguishes shuttle vectors?

Which of the following is NOT a feature of an ideal cloning vector?

What is a primary disadvantage of using BACs (Bacterial Artificial Chromosomes) as vectors?

Why are eukaryotic expression vectors needed?

What role do restriction enzymes play in the use of vectors?

What is the purpose of using a low copy number vector?

Which is a common misconception about vectors in recombinant DNA technology?

How would you classify a cosmid based on its properties?

What feature is essential for a vector to function in both prokaryotes and eukaryotes?

Which of the following organisms is the most commonly used eukaryotic host in recombinant DNA technology?

What is the primary role of vectors in recombinant DNA technology?

What characteristic must a suitable vector possess?

Which type of vector allows cloning of very large DNA fragments (up to 1 million base pairs)?

What is a primary advantage of using yeast as a host organism in recombinant DNA technology?

Which of the following is NOT considered a characteristic of an effective vector?

In yeast artificial chromosomes, what role do telomeres play?

What is the purpose of a selectable marker in a vector?

Which of the following cloning vectors is required for incorporating DNA fragments over 10 kb in eukaryotic systems?

What defines a single copy plasmid's replication strategy?

Which of the following vectors is a hybrid of plasmid and bacteriophage?

Which essential feature must an expression vector possess?

Why are yeast artificial chromosomes used in cloning?

What is a key feature of the pBR322 plasmid?

What role does the autonomously replicating sequence (ARS) play in yeast vectors?

What is the primary function of a shuttle vector?

Which of the following is not a characteristic of shuttle vectors?

What is a primary benefit of using shuttle vectors in biotechnology?

Which two systems do shuttle vectors commonly replicate in?

An example of a prokaryotic cell often used with shuttle vectors is?

What is typically included in the construction of a shuttle vector?

Shuttle vectors are useful for studying which type of gene expression?

Which of the following is an example of a eukaryotic cell that can be used with shuttle vectors?

Shuttle vectors differ from standard plasmids in that they can?

Why might researchers choose to use shuttle vectors in their experiments?

In a shuttle vector, how is the correct origin of replication selected in a specific host?

What critical role does the selectable marker serve in a shuttle vector?

Which of the following types of genes can be studied using shuttle vectors?

What is the primary function of a vector in recombinant DNA technology?

Which of the following is a commonly used prokaryotic host for gene cloning?

What is one characteristic that an expression vector must have?

What is the role of selectable markers in vectors?

Which vector type can accommodate the largest DNA inserts?

What is a shuttle vector?

What is the general role of an inducible promoter in expression vectors?

Which size of DNA insert can a bacteriophage vector accommodate?

What is a disadvantage of using prokaryotic hosts for eukaryotic gene expression?

Which of the following is NOT typically found in an expression vector?

What is the function of the ligation process in rDNA technology?

What is a common advantage of using yeast as a eukaryotic host?

Which structure of a plasmid is crucial for its replication?

In recombinant DNA technology, what is the purpose of the term 'heterologous expression'?

What will likely happen if a recombinant plasmid is not properly maintained within a host cell?

Single Answer MCQ

Q-00095936

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Host-Vector System Practice Worksheets

Download and practice Host-Vector System worksheets to improve problem-solving accuracy and speed for CBSE Class 12 Biotechnology exams.

HostñVector System - Practice Worksheet

This worksheet covers essential long-answer questions to help you build confidence in HostñVector System from Biotechnology for Class 12 (Biotechnology).

Practice

Questions

What is the Host-Vector System and why is it essential for recombinant DNA technology?

The host-vector system is a two-component framework comprising a vector, which carries the gene of interest, and a host organism, which facilitates the replication and expression of that gene. This system is crucial for the cloning of genes, as it allows scientists to manipulate DNA, propagate genes, and express them in a suitable biological context. For instance, vectors like plasmids provide the necessary sequences for replication, while hosts such as E. coli supply the machinery essential for DNA replication and transcription. Knowing the roles of both components helps in understanding gene cloning processes and applications in biotechnology.

Describe the characteristics of an ideal vector for gene cloning.

An ideal vector for gene cloning should possess several key characteristics: it must have an origin of replication (ori) to enable autonomous replication within the host; unique restriction enzyme sites for the insertion of foreign DNA; a selectable marker such as antibiotic resistance to differentiate between transformed and non-transformed cells; and a small size to facilitate easy manipulation and insertion of large inserts. These features enable the efficient cloning, propagation, and selection of recombinant DNA, thereby maximizing the chances of successful gene uptake and expression.

Explain the structure and function of plasmids as vectors.

Plasmids are circular, double-stranded, extrachromosomal DNA molecules that can replicate independently of chromosomal DNA within prokaryotic cells. They typically range from a few thousand base pairs to over 100 kilobase pairs in size. Plasmids serve as vectors in gene cloning due to their ability to integrate foreign DNA through restriction sites. They often include selectable markers, such as antibiotic resistance genes (e.g., ampR, tetR), facilitating the identification of successfully transformed cells. This makes plasmids effective tools for cloning, sequencing, and expressing genes of interest in various research and industrial applications.

Discuss the lambda phage as a vector in gene cloning.

Lambda (λ) phage is a bacteriophage that infects E. coli and serves as an effective vector for cloning due to its capability to carry larger inserts of foreign DNA compared to plasmids. The λ phage genome is linear DNA, with cohesive ends called cos sites that facilitate the packaging of the DNA into phage particles. Once inside the host, it can replicate according to either the lytic or lysogenic lifecycle. In the lytic cycle, the phage replicates quickly to produce new virions, while in the lysogenic cycle, its DNA integrates into the host's chromosome, allowing it to be replicated along with the bacterial DNA. This dual capability is harnessed in various cloning strategies, making λ phage a versatile vector.

What are expression vectors and how do they differ from cloning vectors?

Expression vectors are specialized vectors designed not only to carry a gene of interest but also to allow for its expression in a host cell. Unlike cloning vectors, which primarily focus on replicating DNA, expression vectors contain necessary regulatory elements such as a promoter, ribosome binding site, and terminator sequences that facilitate transcription and translation of the cloned gene into a functional protein. Expression vectors can be used in both prokaryotic and eukaryotic systems, depending on the need for post-translational modifications, and are crucial for producing proteins for research, pharmaceutical, and industrial applications.

How do shuttle vectors function, and what advantages do they provide in genetic engineering?

Shuttle vectors are versatile vectors that can replicate in both prokaryotic and eukaryotic host cells. They are designed with origins of replication suitable for each host, allowing for the cloning and manipulation of genes across different biological systems. The main advantage of shuttle vectors is their ability to facilitate the transfer of genetic information between diverse organisms, enabling researchers to exploit the strengths of various systems for gene expression. For instance, a gene can be cloned in E. coli for efficiency and then transferred to a eukaryotic system for appropriate post-translational modifications, enhancing the utility of recombinant DNA technology.

Explain the role of selectable markers in gene cloning and their importance.

Selectable markers are essential tools in gene cloning that allow for the identification of successfully transformed cells. These markers, often genes that confer resistance to antibiotics (e.g., ampR, tetR), enable researchers to culture cells that have taken up the vector. When bacteria are grown on media containing the corresponding antibiotic, only those that contain the plasmid with the selectable marker will survive and proliferate. This selective survival greatly increases the efficiency of the cloning process by allowing easy differentiation between transformed and non-transformed cells, thus simplifying the identification of successful clones for further study.

What are cosmids and how do they function as vectors for gene cloning?

Cosmids are a type of hybrid vector that combine features of plasmids and bacteriophage λ. They incorporate the cohesive ends of λ phage, allowing insertion of larger DNA fragments (up to 45 kb) compared to typical plasmids. Cosmids replicate as plasmids in bacterial hosts, offering the benefits of both vector types. Their unique design allows for efficient cloning of large DNA segments necessary for mapping complex genomes and studying large genes or operons. This capability makes cosmids valuable tools in genomic projects and gene cloning applications where size limitations are a concern.

Describe the concept of Bacterial Artificial Chromosomes (BACs) and their applications in genetic research.

Bacterial Artificial Chromosomes (BACs) are large plasmid vectors that can carry oversized DNA inserts, typically in the range of 100-300 kb. They are derived from the F-plasmid of E. coli, equipped with a low-copy number replication origin to ensure stability during cell division. BACs facilitate the cloning of large genomic DNA fragments, which is critical for genomic sequencing projects, such as the Human Genome Project. Their ability to maintain large genomic sequences makes BACs indispensable in genetic mapping, studying gene function, and constructing libraries of whole genomes.

HostñVector System - Mastery Worksheet

This worksheet challenges you with deeper, multi-concept long-answer questions from HostñVector System to prepare for higher-weightage questions in Class 12.

Mastery

Questions

Explain the role of plasmids as vectors in recombinant DNA technology, detailing their essential features and the significance of each feature in gene cloning.

Plasmids serve as extrachromosomal DNA in host cells, functioning as vectors for gene cloning. Key features include: 1) Origin of replication (ori) allowing autonomous replication; 2) Selectable markers (for example, antibiotic resistance) for screening successful transformants; 3) Unique restriction sites for targeted gene insertion, preventing fragmentation. Each feature is crucial for the efficiency and effectiveness of cloning and gene propagation.

Compare and contrast E. coli and Bacillus subtilis as prokaryotic hosts in the context of gene cloning, highlighting their advantages and limitations.

E. coli is rapid-growing, widely studied, and has a well-characterized genome, making it ideal for cloning; however, it may modify eukaryotic proteins improperly. Bacillus subtilis, on the other hand, is used for secretory expression of proteins but grows slower and is less understood. Each host's unique characteristics influence its appropriateness for specific cloning purposes.

Discuss the significance of shuttle vectors in recombinant DNA technology. How do they enhance the cloning process compared to standard vectors?

Shuttle vectors facilitate replication in both prokaryotic and eukaryotic cells, allowing researchers to exploit the advantages of both systems. This versatility expands the types of genes that can be studied and expressed, enabling the cloning of eukaryotic genes within a prokaryotic system while providing eukaryotic post-translational modifications. The ability to switch between hosts maximizes experimental flexibility.

Explain the concept of expression vectors, comparing them to conventional cloning vectors. What features are critical for their function?

Expression vectors not only promote the replication of inserted DNA but also facilitate the transcription and translation of the gene product. Critical features include the presence of a strong promoter upstream of the gene, transcription termination sequences, and ribosome binding sites. These features distinguish expression vectors from conventional cloning vectors, which focus only on propagation.

Analyze the impact of introns on the expression of eukaryotic genes in prokaryotic systems. How does this factor into the design of vectors?

Introns present in eukaryotic genes pose a challenge for expression in prokaryotic hosts, which cannot splice RNA. Therefore, when designing vectors for such genes, intron-free versions (cDNA) must be utilized to ensure proper expression. This necessitates techniques such as reverse transcription to create a suitable DNA insert for cloning.

Describe the lambda phage vector system. How does it differ from plasmid vectors in terms of efficiency and capacity for DNA insertion?

Lambda phage vectors can accommodate larger DNA fragments (up to 20 kb) than plasmids (typically ≤10 kb), making them more efficient for cloning larger inserts. Moreover, their lytic lifecycle allows for high yield of phage particles upon host cell lysis, whereas plasmid vectors rely on host replication mechanisms, potentially resulting in lower yields.

Contrast cosmids and phagemids, focusing on their structural components and functional applications in gene cloning.

Cosmids combine features of plasmids and lambda phages, capable of holding larger inserts (up to 45 kb) while maintaining plasmid-like properties such as selectable markers. Phagemids are hybrids that contain lambda phage functions and are utilized for rapid cloning and screening of inserts; they maintain the convenience of plasmid propagation along with phage-based efficiencies.

Evaluate the importance of selectable markers in gene cloning vectors. How do they facilitate the identification of successful transformants?

Selectable markers, like antibiotic resistance genes, enable the identification of cells that have successfully incorporated the vector (and the insert) by allowing only those cells to survive in selective media. This process simplifies the screening of colonies or plaques to find target clones, enhancing efficiency in cloning experiments.

Discuss the role of eukaryotic host systems in gene cloning, specifically focusing on S. cerevisiae and its advantages over prokaryotic systems.

S. cerevisiae is used for the cloning of eukaryotic genes due to its ability to perform post-translational modifications, such as glycosylation, which are essential for the functionality of many proteins. Additionally, yeast can grow both aerobically and anaerobically, make it flexible for various expression systems, unlike bacteria, which have limitations in these areas.

Identify common misconceptions regarding the use of vectors in recombinant DNA technology and clarify these misunderstandings.

Common misconceptions include the belief that all vectors can accept any size of DNA insert or that vectors function similarly in all host systems. In reality, vectors have specific capacities and work optimally within compatible hosts due to differences in replication machinery and cellular environments.

HostñVector System - Challenge Worksheet

The final worksheet presents challenging long-answer questions that test your depth of understanding and exam-readiness for HostñVector System in Class 12.

Challenge

Questions

Discuss the diverse applications of recombinant DNA technology in agriculture, including its ethical implications.

Evaluate how rDNA technology contributes to crop improvement, pest resistance, and food security. Counterpoints could include ethical concerns around genetic modification and biodiversity loss.

Analyze the role of E. coli as a model organism in recombinant DNA technology. What are the advantages and limitations?

Provide insights into the rapid growth, ease of genetic manipulation, and the limitations such as lack of post-translational modifications. Include examples of successful gene cloning using E. coli.

Examine the differences between expression vectors and cloning vectors. Why is the choice of vector crucial for gene expression?

Discuss aspects like promoter strength, selectable markers, and the need for proper transcription termination. Use examples like pUC19 and pBR322.

Evaluate the significance of shuttle vectors in biotechnology. How do they enhance experimental flexibility?

Discuss the concept of dual-host systems and their applications in genetic research. Consider both advantages like efficiency and disadvantages such as stability issues.

Critically assess the development and impact of yeast artificial chromosomes (YACs) in managing large DNA fragments. What challenges do they present?

Identify their role in complex genome mapping and the limitations associated with host cell viability and instability of large inserts.

What are the risks associated with bacteriophage vectors compared to plasmid vectors in gene cloning?

Analyze efficiency in large insert integration, potential for lysogenic cycles, and safety in handling pathogens.

Assess the importance of selectable markers in vector design, including examples of common selectable markers.

Examine how selectable markers alleviate issues in identifying successful clones, with discussions around antibiotic resistance genes as case studies.

Discuss how recombinant DNA technology has advanced vaccine development. Include specific examples in your discussion.

Evaluate instances of recombinant vaccines being safer and more effective, including case studies such as the Hepatitis B vaccine.

Analyze the mechanism of rolling circle replication in bacteriophage vectors and its significance in vector technology.

Explain the process in detail and relate it to efficiency gains in DNA production and cloning efficacy.

Reflect on the impact of CRISPR technology on the traditional host-vector paradigm in biotechnology.

Discuss how CRISPR has transformed genetic engineering, providing precise editing capabilities, and its potential to replace older methods.

Host-Vector System Frequently Asked Questions

Discover the key components of recombinant DNA technology in the Host-Vector System chapter of the Biotechnology book. Learn about the crucial roles of hosts and vectors in gene cloning.

QWhat are the two key components of recombinant DNA technology?

The two key components of recombinant DNA technology are the host and the vector. The host provides the necessary cellular machinery for DNA replication and expression, while the vector acts as a carrier that helps introduce the desired DNA into the host.

QWhy is Escherichia coli commonly used as a host for gene cloning?

Escherichia coli is a widely used host for gene cloning due to its rapid growth and ability to reproduce quickly, doubling its population approximately every 20 minutes. This efficiency makes it ideal for producing large quantities of cloned DNA.

QWhat function do vectors serve in recombinant DNA technology?

Vectors serve as carriers for the DNA insert in recombinant DNA technology. They contain the necessary sequences for replication within the host and often include selectable markers that help identify successful transformations.

QWhat types of vectors are used in gene cloning?

There are several types of vectors used in gene cloning, including plasmids, bacteriophages, cosmids, and artificial chromosomes. Each type is suited for different applications and has unique properties that enable the cloning of various DNA sizes.

QWhat are expression vectors?

Expression vectors are specialized vectors designed not only to carry DNA inserts but also to ensure the effective expression of the cloned genes. They include promoter sequences and may have features for regulating gene expression.

QWhat is a shuttle vector?

Shuttle vectors are versatile vectors capable of replicating in multiple host organisms, both prokaryotic and eukaryotic. They are designed to facilitate the transfer of genes between different types of cells.

QWhy are selectable markers important in vectors?

Selectable markers are crucial in vectors because they allow researchers to identify which cells have successfully integrated the vector. Common markers include antibiotic resistance genes that facilitate the selection of transformed cells.

QWhat are Yeast Artificial Chromosomes (YACs)?

Yeast Artificial Chromosomes (YACs) are vectors designed for cloning large fragments of eukaryotic DNA, often 200-500 kb in size. They incorporate yeast sequences for replication and maintenance within the host.

QWhat is the role of plasmids in gene cloning?

Plasmids are circular DNA molecules that can replicate independently of chromosomal DNA within a host cell. They are commonly used as vectors for cloning because of their ability to accommodate various DNA inserts.

QHow do bacteriophage vectors differ from plasmid vectors?

Bacteriophage vectors are derived from viruses that infect bacteria, allowing them to efficiently package and deliver larger DNA inserts. In comparison, plasmid vectors are simpler and typically used for smaller inserts.

QWhat is gene cloning?

Gene cloning is the process of creating copies of a specific gene by isolating the target DNA, inserting it into a vector, and introducing it into a host organism where it can be replicated and expressed.

QWhat does the term 'high-capacity cloning vector' mean?

High-capacity cloning vectors refer to vectors such as YACs and BACs that can carry large DNA fragments. They are essential for cloning complex eukaryotic genes, which can be significantly larger than typical plasmids.

QWhat are the advantages of using eukaryotic hosts for gene cloning?

Eukaryotic hosts, such as yeast, can perform post-translational modifications essential for the functionality of eukaryotic proteins. They are crucial when expressed genes require such modifications to be active.

QHow do restriction sites function in vectors?

Restriction sites are specific sequences in vectors where restriction enzymes can cut the DNA. This allows for the insertion of foreign DNA at precise locations in the vector.

QWhat is the difference between high-copy and low-copy plasmids?

High-copy plasmids replicate independently of the bacterial chromosomal DNA, allowing for multiple copies per cell. In contrast, low-copy plasmids are maintained in fewer copies, often closely regulated by the host's replication machinery.

QWhy is the lambda phage used in gene cloning?

Lambda phage is commonly used in gene cloning due to its efficiency in transferring large DNA fragments and its well-understood viral life cycle, which facilitates studies on gene expression.

QWhat types of proteins can be produced using recombinant DNA technology?

Recombinant DNA technology can produce various proteins, including hormones, enzymes, and vaccines. It allows for the mass production of proteins that may be difficult to isolate from natural sources.

QWhat role do cohesive ends play in lambda phage vectors?

Cohesive ends are single-stranded regions at the ends of lambda phage DNA that facilitate the circularization of the genome once inside the host cell, enabling effective replication and packaging during infection.

QWhat are the key properties of a good cloning vector?

A good cloning vector should be small for easy manipulation, have an origin of replication for autonomous replication, possess unique restriction sites for DNA insertion, and include a selectable marker for identifying successful clones.

QWhat is the significance of intron removal in eukaryotic gene expression in prokaryotes?

Intron removal is essential for successful gene expression in prokaryotes, as they lack the machinery for splicing. Therefore, eukaryotic genes must be modified to exclude introns for expression in prokaryotic hosts.

QWhat are the applications of shuttle vectors?

Shuttle vectors facilitate the cloning of genes in both prokaryotic and eukaryotic systems, thus expanding the versatility in genetic engineering, gene therapy, and the production of recombinant proteins.

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Host-Vector System Official Textbook PDF

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Host-Vector System Flashcards

Revise key terms and definitions from Host-Vector System with interactive flashcards. Quick recall practice for CBSE Class 12 Biotechnology.

These flash cards cover important concepts from Host-Vector System in Biotechnology for Class 12 (Biotechnology).

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What is the two-component system in rDNA technology?

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Recombinant DNA technology involves a host and a vector. The host allows the recombinant DNA to propagate and express.

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2/20

Define Recombinant DNA (rDNA).

2/20

rDNA is formed when a target gene (insert) is combined with a vector and introduced into a host organism.

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What is a host in recombinant DNA technology?

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A host is an organism that accepts and allows replication of recombinant DNA. Common hosts include E. coli and yeast.

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Why is E. coli commonly used as a host?

4/20

E. coli reproduces rapidly, doubling its population every 20 minutes, making it efficient for gene cloning.

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What are the key features of a good vector?

5/20

A good vector should be small, possess an origin of replication, unique restriction sites, and a selectable marker.

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What role do plasmids play as vectors?

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Plasmids are circular, double-stranded DNA used as vectors that can replicate independently within a host cell.

7/20

Differentiate between high-copy and low-copy plasmids.

7/20

High-copy plasmids replicate independently of the host's chromosomal DNA, allowing 10-30 copies per cell. Low-copy plasmids are restricted to 1-2 copies per cell.

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What is a selectable marker in vectors?

8/20

Selectable markers, such as antibiotic resistance genes, are used to identify which cells have taken up the vector.

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Describe Lambda (λ) phage as a vector.

9/20

λ phage is a bacteriophage that can efficiently clone large inserts of DNA and is easy to propagate.

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What are cosmids?

10/20

Cosmids are hybrid vectors that combine features of plasmids and λ phage, allowing for the cloning of larger DNA inserts (up to 45 kbp).

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What are YACs?

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Yeast Artificial Chromosomes (YACs) are vectors designed for cloning large DNA fragments (200-500 kbp) in yeast.

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What are expression vectors?

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Expression vectors not only carry DNA inserts but also facilitate their expression in the host, containing promoters and terminators.

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What is a shuttle vector?

13/20

Shuttle vectors can replicate in both prokaryotic and eukaryotic cells, allowing for versatile application in gene cloning.

14/20

Explain the term 'heterologous gene expression'.

14/20

Heterologous gene expression refers to expressing a gene from one organism in a different organism, often requiring specific conditions.

15/20

What are the types of plasmids related to drug resistance?

15/20

R-plasmids are a type of plasmid that carry antibiotic resistance genes, providing a survival advantage to bacteria.

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What are episomes?

16/20

Episomes are plasmids that can integrate into the chromosomal DNA of the host cell.

17/20

Define cosmid vectors.

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Cosmid vectors are plasmids that have been modified to include lambda phage sequences, facilitating the cloning of larger DNA segments.

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How do plasmid vectors enhance utility?

18/20

Plasmid vectors are modified to contain specific sequences, such as multiple cloning sites, to increase functionality for gene cloning.

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What is a phasmid vector?

19/20

Phasmids are hybrid vectors that combine properties of both plasmids and phage, retaining the ability to replicate like both.

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What is the significance of the cos sequence in Lambda phage?

20/20

Cos sequences allow for the efficient packaging of DNA into the lambda phage capsid, crucial for cloning operations.

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