MCAT Biochemistry Question 67: 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: 67
7. Which of the following is correct about fat-soluble vitamins?
I. Vitamin E is important for calcium regulation.
II. Vitamin D protects against cancer because it is a biological antioxidant.
III. Vitamin K is necessary for the posttranslational introduction of calcium-binding sites.
IV. Vitamin A is metabolized to retinal, which is important for sight.
- A. III only
- B. I and II only
- C. III and IV only
- D. II, III, and IV only
Correct Answer: C
Explanation:
Vitamin A is metabolized to retinal, which is important for sight. Vitamin D is metabolized to calcitriol, which is important for calcium regulation. Vitamin E is made up of tocopherols, which are biological antioxidants. Vitamin K is necessary for the introduction of calcium binding sites, such as during the posttranslational modification of prothrombin.