Molecular Biology (1) - Lecture 4: Cell Cycle and Cell Division
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Questions and Answers

Which phase of the cell division cycle is specifically responsible for DNA replication in most eukaryotic cells?

  • G2 phase
  • M phase
  • S phase (correct)
  • G1 phase

    • What is the term used to describe the process where one double-stranded DNA molecule produces two identical copies?

  • Non-conservative replication
  • Conservative replication
  • Dispersive replication
  • Semiconservative replication (correct)

    • What is the term used for the structures into which DNA molecules are packaged during cell division?

  • Chromatids (correct)
  • Nucleosomes
  • Histones
  • Centromeres

    • Which type of genome usually consists of a number of DNA molecules?

    <p>Eukaryotic genome</p> Signup and view all the answers

    What serves as a template for the production of the complementary strand during DNA replication?

    <p>Parental DNA molecules</p> Signup and view all the answers

    Which enzyme is responsible for matching the existing DNA bases with complementary nucleotides and linking them together to make the new strand?

    <p>DNA polymerase</p> Signup and view all the answers

    What is the role of helicases in DNA replication?

    <p>Separating the two parental strands at the replication forks</p> Signup and view all the answers

    What is the function of topoisomerases in DNA replication?

    <p>Preventing the DNA double helix from getting too tightly wound</p> Signup and view all the answers

    What is the primary role of primase in DNA replication?

    <p>Generating RNA primers for DNA synthesis</p> Signup and view all the answers

    Where does the replication of a DNA molecule begin?

    <p>At the origin of replication</p> Signup and view all the answers

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

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

    What is the significance of A:T pairs dominating in a sequence of replication origin?

    <p>They are easier to separate than C:G pairs</p> Signup and view all the answers

    Why is it important for the enzymes to prevent the DNA double helix ahead of the replication fork from getting too tightly wound?

    <p>To allow the replication machinery to proceed ahead</p> Signup and view all the answers

    What is the shape of a region where the parental strands of DNA are being unwound during DNA replication?

    <p>&quot;Y&quot;-shaped region</p> Signup and view all the answers

    What type of chromosome does E. coli have and how many origins of replication does it have?

    <p>Circular with a single origin of replication</p> Signup and view all the answers

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