Structure and Properties of Peptides problems
- 1. What is the proportion of glycine residues in collagenous regions?
Options- A. One-fourth
- B. One-third
- C. Half
- D. One-tenth Discuss
Correct Answer: One-third
- 2. 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
Correct Answer: regular folding of regions of the polypeptide chain
- 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
Correct Answer: Decrease in oxygen affinity
- 4. Disulfide bonds most often stabilize the native structure of
Options- A. extracellular proteins
- B. dimeric proteins
- C. hydrophobic proteins
- D. intracellular proteins Discuss
Correct Answer: extracellular proteins
- 5. 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
Correct Answer: C20H32O11N10
- 6. 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 Discuss
Correct Answer: the F & Y angles can assume approximately three different values
- 7. 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
Correct Answer: Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
- 8. 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
Correct Answer: Complete secondary structure
- 9. 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
Correct Answer: four nitrogens of heme, the proximal His, and a water molecule
- 10. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
Options- A. Delta
- B. Epsilon
- C. Gamma
- D. Alfa Discuss
Correct Answer: Epsilon
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