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Home ‣ Biochemistry ‣ Structure and Properties of Peptides Comments
- Question
The peptide bond in proteins is
Options- A. planar, but rotates to three preferred dihedral angles
- B. nonpolar, but rotates to three preferred dihedral angles
- C. nonpolar, and fixed in a trans conformation
- D. planar, and usually found in a trans conformation
- Correct Answer
- planar, and usually found in a trans conformation
- 1. Which of the following statement is incorrect?
Options- A. Hemoglobin and myoglobin are the two oxygen binding proteins
- B. Hemoglobin transports O2 in the blood
- C. Myoglobin stores O2 in muscles
- D. None of the above Discuss
- 2. The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin 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
- 3. In ?-pleated sheet structures neighbouring
Options- A. chains lie in a flat plane
- B. neighboring residues are hydrogen bonded
- C. neighboring chains are connected by a-helices
- D. neighboring chains are hydrogen bonded Discuss
- 4. In the ?-pleated sheet
Options- A. hydrogen bonds are formed between the peptide bonds
- B. adjacent polypeptide chains can either be parallel or antiparallel
- C. the polypeptide chain is fully extended
- D. all of the above Discuss
- 5. Which of the following statements is incorrect?
Options- A. Protein G contains both a-helix and P-sheet
- B. Protein G contains only a-helix
- C. Fatty acid binding protein contains largely P-sheet
- D. Hemoglobin contains four sub-units Discuss
- 6. The resonance structures that can be drawn for the peptide bond indicate that the peptide bond
Options- A. is stronger than an ordinary single bond
- B. has partial double bond character
- C. both (a) and (b)
- D. is still not completely understood Discuss
- 7. Hydrogen bonds in a-helices are
Options- A. more numerous than Vander Waals interactions
- B. not present at Phe residues
- C. analogous to the steps in a spiral staircase
- D. roughly parallel to the helix axis Discuss
- 8. The peptide bond in proteins is
Options- A. only found between proline residues
- B. usually cis unless proline is the next amino acid
- C. usually trans unless proline is the next amino acid
- D. is planar because of steric hinderance Discuss
- 9. The oxygen in hemoglobin and myoglobin is bound to
Options- A. the iron atom in the heme group
- B. the nitrogen atoms on the heme
- C. histidine residues in the protein
- D. lysine residues in the protein Discuss
- 10. The nature of peptide bond can be best explained as
Options- A. partial double bond
- B. truly double bond
- C. Hydrogen bond
- D. Van der waals force Discuss
Structure and Properties of Peptides problems
Search Results
Correct Answer: None of the above
Correct Answer: Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Correct Answer: neighboring chains are hydrogen bonded
Correct Answer: all of the above
Correct Answer: Protein G contains only a-helix
Correct Answer: both (a) and (b)
Correct Answer: roughly parallel to the helix axis
Correct Answer: usually trans unless proline is the next amino acid
Correct Answer: the iron atom in the heme group
Correct Answer: partial double bond
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