Discussion
Home ‣ Biochemistry ‣ Structure and Properties of Peptides Comments
- Question
Which of the three subunits of the G proteins binds GDP and GTP?
Options- A. Alpha
- B. Beta
- C. Gamma
- D. Delta
- Correct Answer
- Alpha
- 1. 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
- 2. 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
- 3. Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
Options- A. Delta
- B. Epsilon
- C. Gamma
- D. Alfa Discuss
- 4. 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
- 5. 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
- 6. For the unfolding reaction of Protein G, ∆H° =210.6 kJ/mol, this means that
Options- A. unfolding is favored enthalpically
- B. folding is favored enthalpically
- C. the entropy is positive at all temperatures
- D. the entropy is negative at all temperatures Discuss
- 7. The correlation between free energy ?G transfer between the aqueous/organic phases and the surface area of amino acid residues
Options- A. reflects the reduction in solvent-accessible area during protein folding
- B. is only meaningful for the polar amino acids
- C. ignores the important contribution of the peptide bond
- D. is similar to effects seen with SDS denaturation Discuss
- 8. Buried hydrophobic side chains in a globular protein fit into a hole formed by the side chains of
Options- A. 1-3 other amino acids
- B. 5-7 other amino acids
- C. 9-12 other amino acids
- D. 13-15 other amino acids Discuss
- 9. Unpaired H-bond donors and acceptors are found in the hydrophobic core of a protein
Options- A. only at the ends of a-helices
- B. only at the turns connecting p-strands
- C. only on Pro residues
- D. rarely Discuss
- 10. Since ?G° = -RTlnK
Options- A. a 10-fold increase in K decreases ?G° by about 10-fold
- B. a 10-fold decrease in K decreases ?G° by about 2.3*RT
- C. a 10-fold increase in K decreases ?G° by about 2.3*RT
- D. a 10-fold decrease in K increases ?G° by about 10-fold Discuss
Structure and Properties of Peptides problems
Search Results
Correct Answer: the Fe2+ and histidine
Correct Answer: the a-helix
Correct Answer: Epsilon
Correct Answer: four nitrogens of heme, the proximal His, and a water molecule
Correct Answer: Complete secondary structure
Correct Answer: folding is favored enthalpically
Correct Answer: reflects the reduction in solvent-accessible area during protein folding
Correct Answer: 5-7 other amino acids
Correct Answer: rarely
Correct Answer: a 10-fold increase in K decreases ?G° by about 2.3*RT
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