Question

question 31
what happens to protein in the stomach?
a proteins are denatured by hcl (hydrochloric acid) and peptide bonds are broken by pepsin.
b amino acids are absorbed.
c proteins are folded in primary, secondary, tertiary, and sometimes quaternary structure.
d all of the above.

Explanation:

When protein is in the stomach, HCl (hydrochloric acid) denatures proteins (disrupts their structure), pepsin breaks peptide bonds (A is correct). Pepsin also breaks proteins into smaller peptides, and amino acids are absorbed in the small intestine (B is incorrect). Protein folding (primary, secondary, tertiary, quaternary) occurs in the cell, not in the stomach (C is incorrect). Since B and C are incorrect, A is the only correct option, so D (All of the above) is incorrect.

Answer:

A. Proteins are denatured by HCl (hydrochloric acid) and peptide bonds are broken by pepsin.