AP®︎ Biology: Topic 2.4 Flashcards

Master key terms and definitions for Topic 2.4 of AP Biology – Membrane Permeability to help you prep for quizzes and the AP exam.

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Term

Fluid Mosaic Model

Definition

A dynamic membrane model with moving phospholipids and embedded proteins forming a flexible mosaic.

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Fluid Mosaic Model
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A dynamic membrane model with moving phospholipids and embedded proteins forming a flexible mosaic.

2.4.A
Transport Proteins and Channel Proteins
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Embedded membrane proteins that move hydrophilic substances across the bilayer; channels are passive, transport proteins may actively pump.

2.4.A2.4.A.2
Plasma Membrane
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The cell boundary that separates internal conditions from the external environment.

2.4.A2.4.A.1
Phospholipid Bilayer
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A double phospholipid layer with a hydrophobic interior that causes selective permeability.

2.4.A2.4.A.1
Selective Permeability
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A membrane property where small nonpolar molecules cross easily but polar molecules and ions do not.

2.4.A2.4.A.2
Cell Wall
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A rigid outer layer that supports cells, limits some substances, and prevents osmotic lysis.

2.4.B2.4.B.1