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

A cell is placed in a solution containing a solute that cannot cross the plasma membrane. The external solution has a higher effective solute concentration than the cell interior. What is the net movement of water?

A.Water moves out of the cell toward the hypertonic external solution
B.Water moves into the cell because the impermeant solute attracts water inward
C.There is no net water movement because the solute cannot cross the membrane
D.Water and solute move together into the cell at equal rates

Explanation

Core Concept

An impermeant solute contributes to tonicity because it cannot equilibrate across the membrane. If its effective concentration is higher outside the cell, the external solution is hypertonic and water moves out by osmosis.

Correct Answer

AWater moves out of the cell toward the hypertonic external solution

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