18. Which statement is correct about the three dimensional structure(s) of prote

Question

18. Which statement is correct about the three dimensional structure(s) of proteins?

a. An alpha-helix is typically more extended (i.e., greater distance between each amino acid) than a beta-pleated sheet as evidenced by the greater rise of the helix.

b. For proteins localized to the cytoplasm of the cell, amino acids with hydrophobic side chains are typically found on the exterior surfaces of the protein.

c. Extracellular proteins are commonly stabilized by disulfide bonds.

d. Extremes of pH increase the content of salt bridges.

e. A beta-turn connects parallel strands in a beta-pleated sheet.

16. Which amino acid can form a salt bridge with glutamate?

a. G

b. L

c. K

d. W

e. N

Explanation / Answer

Extracellular proteins are stabilized by disulfide bonds. Correct

K (lysine) forms salt bridge with glutamate

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