Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologymediummcq1 pt

A red blood cell is moved from normal plasma into a solution with a higher concentration of nonpenetrating solute than the cytosol. What change is expected?

A.Water enters by osmosis until the cell swells and bursts
B.Sodium ions rush inward, expanding the cell without water movement
C.Aquaporins close immediately, sealing the membrane against any water loss
D.Water exits by osmosis and the cell shrivels as volume drops

Explanation

Core Concept

The external solution is hypertonic to the red blood cell, so water moves out by osmosis. Cell volume decreases and the membrane becomes crenated. Specifying nonpenetrating solute is essential because total solute concentration alone does not determine tonicity.

Correct Answer

DWater exits by osmosis and the cell shrivels as volume drops

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