Macromolecules and Biochemistry Quiz
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Questions and Answers

What is the one-letter abbreviation for the two peptides?

  • C, D
  • A, B (correct)
  • G, H
  • E, F

    • At pH = 7.0, what charges do the two peptides have?

  • Both negative
  • One positive and one negative (correct)
  • Both positive
  • One neutral and one negative

    • What is the isoelectric point (pI) for each peptide?

  • 4.5, 11.0
  • 6.0, 8.0
  • 7.0, 7.0 (correct)
  • 2.0, 9.0

    • Which of the following is a weak acid?

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

    What do weak acid (base) ionization constant and Henderson-Hasselbach equation relate to?

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

    Which characteristic differentiates lipids from other biopolymers?

    <p>Insolubility in water</p> Signup and view all the answers

    Is a virus considered a form of life?

    <p>No, due to dependency on host cells for replication</p> Signup and view all the answers

    What do weak, noncovalent interactions contribute to in biological systems?

    <p>Stability of DNA double helix</p> Signup and view all the answers

    Which concept relates to the choice of ATP as the energy currency?

    <p>$ ext{High-energy molecules}$</p> Signup and view all the answers

    What is the predominant factor in protein stability?

    <p>Hydrogen bond formation</p> Signup and view all the answers

    Why is there so little allowable rotation in the peptide bond?

    <p>Presence of hydrogen bonds</p> Signup and view all the answers

    The alpha helix is characterized by:

    <p>Coil-like structure stabilized by hydrogen bonds</p> Signup and view all the answers

    Which is the more stable beta sheet: parallel or antiparallel?

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

    What statement regarding the tertiary structure of proteins is false?

    <p>It is stabilized by disulfide bonds in all proteins</p> Signup and view all the answers

    What contributes to the stabilization of protein structure?

    <p>All of the above</p> Signup and view all the answers

    Which statement regarding protein structure is true?

    <p>Secondary structure involves interactions between R groups of amino acids</p> Signup and view all the answers

    What is the main role of disulfide bonds in protein structure?

    <p>Stabilizing secondary structures</p> Signup and view all the answers

    Why do proteins have limited allowable rotation around the peptide bond?

    <p>To maintain stability and rigidity of protein structure</p> Signup and view all the answers

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