MCAT Biochemistry Question 172: Answer and Explanation
Home > MCAT Test > MCAT biochemistry practice tests
Test Information
- Use your browser's back button to return to your test results.
- Do more MCAT biochemistry practice tests.
Question: 172
7. With prolonged fasting, the brain can turn to which alternative fuel for energy?
- A. Fructose
- B. Lactate
- C. Ketone bodies
- D. Fatty acids
Correct Answer: C
Explanation:
The brain is almost exclusively dependent on glucose for energy; however, in a prolonged fast, ketone bodies can be used for up to 
of the brain’s energy requirement.