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DNA Replication: Semiconservative Model
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DNA Replication: Semiconservative Model

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Questions and Answers

What type of DNA replication involves one old and one newly made strand in the replicated double helix?

  • Semiconservative model (correct)
  • Conservative model
  • Dispersive model
  • Concerted model
  • What is the role of helicases in DNA replication?

  • Relieving strain ahead of the replication fork
  • Unwinding the double helix (correct)
  • Adding nucleotides to the growing DNA strand
  • Synthesizing RNA primers
  • Which enzyme synthesizes RNA primers during DNA replication?

  • Topoisomerase
  • Primase (correct)
  • DNA polymerase
  • Helicase
  • In what direction does DNA polymerase elongate the new DNA strand?

    <p>5' to 3'</p> Signup and view all the answers

    What is the function of single-strand binding proteins in DNA replication?

    <p>Stabilizing unwound DNA strands</p> Signup and view all the answers

    Which molecule released during nucleotide addition helps drive the polymerization reaction during DNA replication?

    <p>Pyrophosphate</p> Signup and view all the answers

    What is the primary difference between the synthesis of the leading and lagging strands during DNA replication?

    <p>The leading strand is synthesized continuously, while the lagging strand is synthesized discontinuously.</p> Signup and view all the answers

    What is the function of DNA ligase in DNA replication?

    <p>To join the sugar-phosphate backbones of Okazaki fragments into a continuous DNA strand.</p> Signup and view all the answers

    Why does DNA replication only proceed in the 5′→3′ direction?

    <p>As a result of the physical and chemical structure of nucleotides.</p> Signup and view all the answers

    When does DNA polymerase I replace RNA nucleotides with DNA nucleotides?

    <p>After each Okazaki fragment is synthesized.</p> Signup and view all the answers

    Which enzyme plays a key role in reducing the error rate during DNA replication?

    <p>Mismatch repair enzymes</p> Signup and view all the answers

    Why is lagging strand synthesis slightly delayed relative to leading strand synthesis?

    <p>As a result of the series of short Okazaki fragments being primed separately.</p> Signup and view all the answers

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