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Home Biochemistry Structure and Properties of Peptides Comments

  • Question
  • The Ramachandran Plot illustrates the fact that


  • Options
  • A. the peptide bond is planar
  • B. the F & Y angles can assume any value in a peptide
  • C. the F & Y angles can assume only a single value in a protein
  • D. the F & Y angles can assume approximately three different values

  • Correct Answer
  • the F & Y angles can assume approximately three different values 


  • Structure and Properties of Peptides problems


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    • 1. The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?

    • Options
    • A. C20H50O20N10
    • B. C20H32O11N10
    • C. C20H40O10N10
    • D. C20H68O29N10
    • Discuss
    • 2. Disulfide bonds most often stabilize the native structure of

    • Options
    • A. extracellular proteins
    • B. dimeric proteins
    • C. hydrophobic proteins
    • D. intracellular proteins
    • Discuss
    • 3. What is the effect of a decrease in pH on hemoglobin oxygen affinity?

    • Options
    • A. Decrease in oxygen affinity
    • B. Increase in oxygen affinity
    • C. No effect on oxygen affinity
    • D. Increase affinity in muscle cell otherwise decrease
    • Discuss
    • 4. Secondary structure in protein refers to

    • Options
    • A. linear sequence of amino acids joined together by peptide bond
    • B. three dimensional arrangement of all amino acids in polypeptide chain
    • C. regular folding of regions of the polypeptide chain
    • D. protein made up of more than one polypeptide chain
    • Discuss
    • 5. What is the proportion of glycine residues in collagenous regions?

    • Options
    • A. One-fourth
    • B. One-third
    • C. Half
    • D. One-tenth
    • Discuss
    • 6. The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:

    • Options
    • A. Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
    • B. Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
    • C. Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
    • D. Val-Lys-Glu + Met-Ser-Trp-Arg-Ala
    • Discuss
    • 7. If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?

    • Options
    • A. Complete secondary structure
    • B. Complete tertiary structure
    • C. Complete quaternary structure
    • D. Thermodynamic stability
    • Discuss
    • 8. In deoxy hemoglobin (Hb), the Fe (II) is coordinated to

    • Options
    • A. four nitrogens of heme, the proximal His, and a water molecule
    • B. four nitrogens of heme and to a water molecule
    • C. two nitrogens of heme and to three His residues in Hb
    • D. two nitrogens of heme and to three water molecules
    • Discuss
    • 9. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

    • Options
    • A. Delta
    • B. Epsilon
    • C. Gamma
    • D. Alfa
    • Discuss
    • 10. The major element of secondary structure in myoglobin and hemoglobin is

    • Options
    • A. the P-strand
    • B. the a-helix
    • C. the reverse turn
    • D. All of these
    • Discuss


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