MCAT Biochemistry Question 119: Answer and Explanation

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Question: 119

14. Which of the following statements conflicts with the fluid mosaic model?

  • A. The cell membrane is static in structure.
  • B. Membrane components can be derived from multiple biomolecules.
  • C. Hydrophobic interactions stabilize the lipid bilayer.
  • D. Proteins are asymmetrically distributed within the cell membrane.

Correct Answer: A

Explanation:

The fluid mosaic model accounts for a dynamic membrane. In this model, membrane components contain both fatty and carbohydrate-derived components, eliminating choice (B). Further, the membrane is stabilized by the hydrophobic interactions of both fatty acid tails and membrane proteins, which may be found on the cytosolic or extracellular side of the membrane, or may run directly through the membrane; thus, choices (C) and (D) are also eliminated.

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