Question

the picture represents a protein in the stomach being broken down into individual amino acids. which is mixed with proteins to break them into amino acids?
☐ villi
☐ enzymes
☐ saliva
☐ fat

Explanation:

To determine what breaks proteins into amino acids, we analyze each option:

• Villi are small intestinal structures for absorption, not protein breakdown.
• Enzymes (like proteases) catalyze the breakdown of proteins into amino acids, matching the process shown.
• Saliva contains amylase for starch, not protein breakdown.
• Fat is unrelated to protein digestion.

Thus, enzymes are the correct choice.

Answer:

B. enzymes (assuming the option for enzymes is labeled as such; if the options are ordered as given, the second option: enzymes)