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

A drug prevents a freshwater protist's contractile vacuole from contracting while the protist remains in dilute pond water. What is the most likely result?

A.The cell rapidly dehydrates because water is pumped outward faster
B.The cell becomes isotonic by synthesizing a cellulose wall
C.Osmosis stops because the vacuole is no longer active
D.Water accumulates inside the cell, causing swelling and possible lysis

Explanation

Core Concept

Freshwater is hypotonic relative to the protist's cytoplasm, so water continuously enters by osmosis. A contractile vacuole normally collects and expels that excess water. If contraction is blocked, water accumulates and the cell swells, potentially leading to lysis.

Correct Answer

DWater accumulates inside the cell, causing swelling and possible lysis

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