MCAT Biochemistry Question 111: Answer and Explanation
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Question: 111
6. Which lipid type is LEAST likely to contribute to membrane fluidity?
- A. Unsaturated glycerophospholipids
- B. trans glycerophospholipids
- C. Cholesterol
- D. Unsaturated sphingolipids
Correct Answer: B
Explanation:
Compounds that contribute to membrane fluidity will lower the melting point or disrupt the crystal structure. Cholesterol, choice (C), and unsaturated lipids, choices (A) and (D), are known for these functions. trans glycerophospholipids tend to increase the melting point of the membrane and therefore decrease membrane fluidity.