MCAT Biochemistry Question 152: Answer and Explanation

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Question: 152

2. What is the fate of long-chain fatty acids that are contained within micelles?

  • A. Transport into chylomicrons released into the lymphatic system
  • B. Transport into chylomicrons released into the circulatory system
  • C. Direct diffusion across the intestine into the circulatory system
  • D. Direct diffusion across the intestine into the lymphatic system

Correct Answer: A

Explanation:

Short-chain fatty acids are soluble in the intestinal lumen, and thus do not interact with micelles as longer fatty acid chains do. The long-chain fatty acids are taken up by the intestinal cells and packaged into triacylglycerols for transport as chylomicrons. Chylomicrons exit the intestine through lacteals that feed into the lymphatic system, which joins with the bloodstream in the base of the neck through the thoracic duct.

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