Antibody Library Construction and Screening Quiz
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Questions and Answers

What is one key advantage of shuffling the L and H chains in a combinatorial library to obtain Fv molecules?

  • Lower efficiency in screening bacteriophage plaques
  • Reduced need for random mutagenesis
  • Decreased variation in the molecules
  • Increased recognition of unusual epitopes (correct)

How was the bacteriophage λ vector engineered to address the drawback of lysing bacterial host cells?

  • Inserting H and L chain DNA sequences into a site flanked by plasmid DNA sequences (correct)
  • Removing the H and L chain DNA sequences from the vector entirely
  • Enhancing the protein production capacity of the vector
  • Increasing the lytic activity of the bacteriophage λ vector

What is a significant benefit of using the phage display technique for antibody production?

  • Increased need for hybridoma development
  • Limited variations in gene copy number
  • No need for animal immunization (correct)
  • Decreased quantification capabilities

How does the use of plasmids in E.coli enhance antibody production?

<p>Facilitates the production of large numbers of Fv fragments (B)</p> Signup and view all the answers

Why are bacteriophage λ vectors not ideal for large-scale protein production?

<p>They lyse bacterial host cells (D)</p> Signup and view all the answers

In what way does random mutagenesis contribute to achieving even greater variation in combinatorial libraries?

<p>By introducing diverse mutations into DNA sequences (B)</p> Signup and view all the answers

What is the purpose of using two different restriction enzymes in directional cloning?

<p>To create non-complementary sticky ends (D)</p> Signup and view all the answers

How do bacteriophage vectors differ from plasmids in the context of antibody production?

<p>Bacteriophage vectors contain plasmid sequences (B)</p> Signup and view all the answers

What is the number of different antibodies that can be expected from a phage library compared to the mammalian antibody repertoire?

<p>$10^8$ (D)</p> Signup and view all the answers

Why is biopanning used in the context of phage display technology?

<p>To selectively enrich phages that bind to antigens (B)</p> Signup and view all the answers

What is the primary advantage of combining L and H chain cDNAs on one vector in antibody production?

<p>To create a diverse array of unique antibody genes (C)</p> Signup and view all the answers

How does using different restriction enzymes affect the generation of combinatorial antibody libraries?

<p>It creates a random set of libraries for screening (D)</p> Signup and view all the answers

What is the advantage of cloning and expressing complete antibody molecules in E.coli for therapeutic purposes?

<p>Direct screening of E.coli libraries for binding to various antigens (B)</p> Signup and view all the answers

What is the role of the fusion protein that becomes anchored within the inner membrane of E.coli during the expression of antibody molecules?

<p>Facilitates secretion of antibodies into the periplasm (C)</p> Signup and view all the answers

How are full-length antibodies engineered in E.coli libraries to ensure their secretion into the periplasm?

<p>By anchoring them to the inner membrane using a fusion protein (A)</p> Signup and view all the answers

What is the purpose of engineering E.coli to express a fusion protein containing a portion of Staphylococcus aureus protein A?

<p>To facilitate binding of antibodies to antigens (B)</p> Signup and view all the answers

Why is it advantageous for therapeutic antibodies to be full length in many applications?

<p>Increased binding affinity to antigens (B)</p> Signup and view all the answers

What is the key advantage of screening an E.coli library directly for binding to antigens?

<p>Facilitates the selection of antibodies with specified affinities (C)</p> Signup and view all the answers

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