MCAT Biochemistry Question 154: Answer and Explanation
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Question: 154
4. How do chylomicrons and VLDLs differ?
- A. Chylomicrons contain apoproteins, VLDLs do not.
- B. Chylomicrons are synthesized in the intestine, VLDLs are synthesized in the liver.
- C. Chylomicrons transport triacylglycerol, VLDLs transport cholesterol.
- D. VLDLs are another term for chylomicron remnants; they differ in age.
Correct Answer: B
Explanation:
Chylomicrons and VLDLs are very similar. Both contain apolipoproteins and primarily transport triacylglycerol, eliminating choices (A) and (C). The only major difference between them is the tissue of origin. Chylomicrons transport dietary triacylglycerol and originate in the small intestine, while VLDLs transport newly synthesized triacylglycerol and originate in the liver.