Macromolecules and Thermodynamics Quiz
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Questions and Answers

Which factor is the predominant factor in protein stability?

  • Disulfide bond
  • Hydrophobic effect (correct)
  • Nonpeptide covalent bonds
  • Salt bridges

    • What is true regarding protein structure?

  • Van der Waals interactions are insignificant
  • Hydrophobic side chains are in the interior of the native protein (correct)
  • Entropy is not a consideration when determining stability
  • Hydrophilic side chains are never found in the interior

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

  • The partial double bond character makes the peptide bond planar (correct)
  • The R group prevents rotation about the peptide bond except for glycine
  • Peptide bonds are amide bonds
  • The C-N bond is shorter
  • Peptide bonds are only formed in the cis configuration

    • What stabilizes the α helix?

    <p>Stabilized by hydrophobic amino acids</p> Signup and view all the answers

    What primarily stabilizes the β sheet?

    <p>Primarily stabilized by hydrogen bonds</p> Signup and view all the answers

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

    <p>Antiparallel due to more linear hydrogen bonds</p> Signup and view all the answers

    Which statement regarding the tertiary structure of proteins is false?

    <p>Many proteins can be classified as either globular or fibrous, but not both</p> Signup and view all the answers

    What does denaturing followed by renaturing of a protein demonstrate?

    <p>Demonstrates that primary structure dictates tertiary structure</p> Signup and view all the answers

    What is needed for acid-base equilibrium concepts to be applied to amino acids, including titration curve, ionization states, and pI?

    <p>Knowledge of buffer solutions and Henderson-Hasselbach equation</p> Signup and view all the answers

    What does the second law of thermodynamics state?

    <p>In any spontaneous process, there is always an increase in the entropy of the universe</p> Signup and view all the answers

    What is the primary function of hemoglobin?

    <p>Transport of oxygen in the blood</p> Signup and view all the answers

    Which type of bond is responsible for stabilizing the secondary structure of proteins such as alpha helices and beta sheets?

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

    What is the main function of myoglobin in muscle cells?

    <p>Stores oxygen for use during muscle contraction</p> Signup and view all the answers

    What effect does 2,3-BPG have on hemoglobin's affinity for oxygen?

    <p>Decreases affinity for oxygen</p> Signup and view all the answers

    In the context of protein-ligand binding, what does the term 'cooperativity' refer to?

    <p>The binding of multiple ligands to different protein subunits</p> Signup and view all the answers

    Which type of bond is responsible for stabilizing the tertiary structure of a protein?

    <p>Disulfide bond</p> Signup and view all the answers

    What is the main function of antibodies in the immune system?

    <p>Recognition and neutralization of antigens</p> Signup and view all the answers

    8

    <p>Lipids are the only macromolecules that are not polymers.</p> Signup and view all the answers

    What is the primary role of buffers like glycine in biological systems?

    <p>Maintaining stable pH levels in cells and tissues</p> Signup and view all the answers

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