AP®︎ Biology: Topic 2.6 Flashcards

Master key terms and definitions for Topic 2.6 of AP Biology – Facilitated Diffusion to help you prep for quizzes and the AP exam.

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Term

Facilitated Diffusion

Definition

Passive movement of polar molecules or ions through membrane proteins down their concentration gradient.

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Facilitated Diffusion
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Passive movement of polar molecules or ions through membrane proteins down their concentration gradient.

2.6.A
Large Polar Molecules and Membrane Passage
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Large polar molecules cannot pass easily through the bilayer and move through transport proteins.

2.6.A2.6.A.2
Concentration Gradient
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A difference in substance concentration across space that drives net movement from high to low.

2.6.A
Membrane Polarization
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An unequal distribution of electrical charge across a membrane caused by ion movement.

2.6.A2.6.A.1
Aquaporins
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Channel proteins that allow rapid movement of large quantities of water across membranes.

2.6.A2.6.A.3
Simple Diffusion vs. Facilitated Diffusion
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Simple diffusion crosses the bilayer directly; facilitated diffusion uses proteins, but both move down gradients.

2.6.A
Channel Proteins and Ion Passage
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Membrane proteins form hydrophilic pathways that let charged ions cross the hydrophobic bilayer.

2.6.A2.6.A.1
Passive Transport
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Movement of substances across membranes down their concentration gradient without energy input.

2.6.A2.6.A.2