Chemical Bonding in Macromolecules
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Questions and Answers

What is the major difference between the A-form and B-form helices?

  • A-form helix is right-handed, while B-form helix is left-handed
  • A-form helix has a narrower, elongated structure compared to the B-form helix
  • A-form helix has a deeper, narrower major groove than the B-form helix (correct)
  • A-form helix has a wider, more accessible major groove than the B-form helix

    • Under which conditions does the Z-form of DNA typically form?

  • Under high salt concentrations (correct)
  • Under physiological conditions
  • Under nonphysiological conditions
  • Under low salt concentrations

    • What feature distinguishes an A-DNA helix from other DNA forms?

  • Right-handed structure
  • Shorter distance per complete turn
  • Formation under physiological conditions
  • Presence of a 2′ hydroxyl group on the ribose sugar (correct)

    • What type of base pairs can be found in a hairpin RNA secondary structure?

    <p>Both Watson–Crick and G-U base pairs</p> Signup and view all the answers

    Which form of DNA has a pitch of 3.2 to 3.4?

    <p>B-form</p> Signup and view all the answers

    What characteristic makes the B-form DNA more accessible to proteins compared to the A-form DNA?

    <p>Narrow major groove</p> Signup and view all the answers

    In what direction does the hairpin RNA strand loop back to form a stem?

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

    'Highly-developed secondary structure in RNA due to intramolecular base pairing' is associated with which figure?

    <p>'Figure 1.14'</p> Signup and view all the answers

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