Multiple Choice
A protein's hydrogen bonds are broken and its structure is unfolded when the protein:
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4. Protein Structure
Denaturation
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In the stomach, what is the primary role of hydrochloric acid (HCl) in protein digestion?
A
It directly hydrolyzes peptide bonds in proteins into free amino acids without requiring enzymes.
B
It emulsifies dietary fats to increase the surface area for pancreatic lipase action.
C
It neutralizes stomach acid to raise pH, optimizing trypsin activity in the stomach.
D
It denatures dietary proteins and helps activate pepsinogen to pepsin, increasing susceptibility to proteolysis.
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