Introduction to Gene Cloning

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Questions and Answers

What is the purpose of gene cloning?

  • To introduce a foreign DNA molecule into a replicating cell
  • To cut DNA with restriction enzymes
  • To amplify the production of DNA fragments (correct)
  • To isolate and purify a single DNA fragment

What is the role of Southern blot technique in gene cloning?

  • Separating DNA fragments by Agarose gel electrophoresis
  • Cutting DNA with restriction enzymes
  • Transferring DNA from the fragile gel to a nylon sheet and hybridizing with a probe (correct)
  • Purifying DNA from cells

What is the function of an expression vector in gene cloning?

  • To cut DNA with restriction enzymes
  • To introduce a specific gene into a target cell and produce the encoded protein (correct)
  • To separate DNA fragments by Agarose gel electrophoresis
  • To isolate and purify a single DNA fragment

What is the purpose of the origin of replication in an expression vector (plasmid)?

<p>To allow the plasmid to replicate independently in the host cell (D)</p> Signup and view all the answers

Which feature is crucial for identifying colonies containing the gene of interest in a recombinant plasmid?

<p>Blue/White screening using Xgal substrate (D)</p> Signup and view all the answers

What is the purpose of the transcription termination sequence in an expression vector (plasmid)?

<p>To terminate transcription of the inserted gene (B)</p> Signup and view all the answers

Why is a strong termination codon important in an expression vector (plasmid)?

<p>To terminate transcription of the inserted gene (C)</p> Signup and view all the answers

What is the purpose of the polylinker in an expression vector (plasmid)?

<p>To provide a site for gene insertion (C)</p> Signup and view all the answers

Why is ampicillin used in the identification of colonies containing recombinant plasmids?

<p>To provide antibiotic resistance for transformed cells containing plasmids (C)</p> Signup and view all the answers

What technique is used to grow transformed bacterial cells on medium containing ampicillin?

<p>Chemical Transformation using Calcium Chloride (C)</p> Signup and view all the answers

How are successful insertions identified in Blue/White screening using Xgal substrate?

<p>LacZ(-) white colonies (D)</p> Signup and view all the answers

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