MCAT Biochemistry Question 68: Answer and Explanation

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Question: 68

8. Which of the following is true of amphipathic molecules?

  • A. They form protective spheres in any solvent, with hydrophobic molecules interior and hydrophilic molecules exterior.
  • B. They have two fatty acid chains and a polar head group.
  • C. They are important to the formation of the phospholipid bilayer and soap bubbles.
  • D. They have a glycerol base.

Correct Answer: C

Explanation:

Phospholipids are amphipathic, as are fatty acid salts. Although amphipathic molecules take spherical forms with hydrophobic molecules interior in aqueous solution, as in choice (A), the opposite would be true in a nonpolar solvent. Choice (B) describes phospholipids and sphingolipids, and choice (D) describes triacylglycerols and phospholipids; both groups do not include fatty acid salts.

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