MCAT Biochemistry Question 71: Answer and Explanation
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Question: 71
11. Which of the following is true about glycerophospholipids?
- A. Glycerophospholipids can sometimes be sphingolipids, depending on the bonds in their head groups.
- B. Glycerophospholipids are merely a subset of phospholipids.
- C. Glycerophospholipids are used in the ABO blood typing system.
- D. Glycerophospholipids have one glycerol, one polar head group, and one fatty acid tail.
Correct Answer: B
Explanation:
Glycerophospholipids are a subset of phospholipids, as are sphingomyelins. Glycerophospholipids are never sphingolipids because they contain a glycerol backbone (rather than sphingosine or a sphingoid backbone), eliminating choice (A). Sphingolipids are used in the ABO blood typing system, eliminating choice (C). Glycerophospholipids have a polar head group, glycerol, and two fatty acid tails, not one, as in choice (D).