MCAT Biology Question 132: Answer and Explanation
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Question: 132
12. Starch is hydrolyzed into maltose by enzymes from the:
salivary glands.
brush border.
pancreas.
- A. I only
- B. I and III only
- C. II and III only
- D. I, II, and III
Correct Answer: B
Explanation:
Starch is hydrolyzed to maltose by two enzymes: salivary amylase (secreted by the salivary glands) in the mouth and pancreatic amylase (secreted by the pancreas) in the duodenum. Brush-border disaccharidases can further break down maltose, but do not break down starch.