Discussion
Home ‣ Biochemistry ‣ Structure and Properties of Peptides Comments
- Question
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
- Correct Answer
- Complete secondary structure
- 1. 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
- 2. 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
- 3. 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
- 4. Disulfide bonds most often stabilize the native structure of
Options- A. extracellular proteins
- B. dimeric proteins
- C. hydrophobic proteins
- D. intracellular proteins Discuss
- 5. 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
- 6. 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
- 7. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
Options- A. Delta
- B. Epsilon
- C. Gamma
- D. Alfa Discuss
- 8. 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
- 9. The heme is held in place by a bond between
Options- A. the Fe2+ and cysteine
- B. the Fe3+ and histidine
- C. the Fe3+ and cysteine
- D. the Fe2+ and histidine Discuss
- 10. Which of the three subunits of the G proteins binds GDP and GTP?
Options- A. Alpha
- B. Beta
- C. Gamma
- D. Delta Discuss
Structure and Properties of Peptides problems
Search Results
Correct Answer: Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
Correct Answer: the F & Y angles can assume approximately three different values
Correct Answer: C20H32O11N10
Correct Answer: extracellular proteins
Correct Answer: Decrease in oxygen affinity
Correct Answer: four nitrogens of heme, the proximal His, and a water molecule
Correct Answer: Epsilon
Correct Answer: the a-helix
Correct Answer: the Fe2+ and histidine
Correct Answer: Alpha
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