Structure and Properties of Peptides – Section 1

11. An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

A. fibrous proteins
B. collagen
C. globular proteins
D. silk protein

Correct Answer: C. globular proteins

12. What was the first protein whose complete tertiary structure was determined?

A. Lysozyme
B. Myoglobin
C. Pancreatic ribonuclease
D. Pancreatic DNase

Correct Answer: B. Myoglobin

13. The peptide bond in proteins is

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: D. planar, and usually found in a trans conformation

14. In β-pleated sheet, structures neighboring

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

Correct Answer: D. neighboring chains are hydrogen bonded

15. The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce

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.

Correct Answer: B. Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.

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