Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

A plant cell sits in a sugar solution whose nonpenetrating solute concentration exactly matches its cytoplasm. Water crosses the membrane freely in both directions. Which state describes the cell?

A.Turgid, because the wall forces water inward regardless of outside concentration
B.Plasmolyzed, with the membrane pulled away from the wall
C.Flaccid, with no net water movement because the solution is isotonic
D.Bursting, because sugar drags water inward uncontrollably

Explanation

Core Concept

Matching nonpenetrating solute levels mean water exits and enters at equal rates, so the cell neither firms up with turgor pressure nor plasmolyzes. In isotonic surroundings the protoplast rests against the wall without pressing on it, and leaf tissue feels limp rather than crisp. Directional balance, not absence of crossing, defines the state.

Correct Answer

CFlaccid, with no net water movement because the solution is isotonic

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