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Steps to DNA Cloning quiz

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  • What are the two main steps involved in DNA cloning?
    The two main steps are creating recombinant DNA and transforming the recombinant DNA into bacteria.
  • What is recombinant DNA?
    Recombinant DNA is a single molecule that contains DNA from two different sources.
  • What enzyme is used to cut DNA during the creation of recombinant DNA?
    Restriction enzymes are used to cut DNA at specific sequences called restriction sites.
  • What are restriction sites?
    Restriction sites are specific DNA sequences where restriction enzymes bind and cut the DNA.
  • What are sticky ends in DNA cloning?
    Sticky ends are single-stranded DNA overhangs produced by restriction enzyme cuts, which facilitate joining DNA fragments.
  • What enzyme is used to join DNA fragments during recombinant DNA creation?
    DNA ligase enzymes covalently join the sticky ends of DNA fragments.
  • Why can only DNA fragments cut by the same restriction enzyme be ligated together?
    Only fragments cut by the same restriction enzyme have compatible sticky ends that can be joined by DNA ligase.
  • What is the purpose of transformation in DNA cloning?
    Transformation allows bacteria to uptake recombinant DNA, making them transgenic organisms.
  • What is a transgenic organism in the context of DNA cloning?
    A transgenic organism is one that has received and expresses recombinant DNA from a different species.
  • How can scientists identify bacteria that have successfully taken up recombinant DNA?
    Scientists use phenotypic markers, such as antibiotic resistance, to identify transformed bacteria.
  • What is a cloning vector in DNA cloning?
    A cloning vector is a recombinant DNA molecule used to carry the gene of interest into a host cell.
  • What medical application is mentioned for DNA cloning?
    DNA cloning is used to produce proteins like insulin in transgenic bacteria for diabetic patients.
  • How is human insulin produced using DNA cloning?
    The human insulin gene is inserted into a bacterial plasmid, transformed into bacteria, which then express and produce insulin.
  • What happens to bacteria after they are transformed with recombinant DNA containing the insulin gene?
    The bacteria replicate, each containing the recombinant DNA, and express the human insulin gene.
  • What is the final product obtained from transgenic bacteria in the context of insulin production?
    The final product is purified human insulin protein, which can be used to treat diabetic patients.