MCAT Organic Chemistry Question 113: Answer and Explanation
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Question: 113
8. Which of the following is true with respect to a micelle in a hydrophilic environment?
- A. The interior is hydrophilic.
- B. The structure, as a whole, is hydrophobic.
- C. It is composed of short-chain fatty acids with polar heads.
- D. It can dissolve nonpolar molecules deep in its core.
Correct Answer: D
Explanation:
Micelles are self-assembled aggregates of soap in which the interior is composed of long hydrocarbon (fatty) tails, which can dissolve nonpolar molecules. The outer surface is covered with carboxylate groups, which makes the overall structure water-soluble. Soaps, in general, are salts of long-chain hydrocarbons with carboxylate head groups.