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AQA GCSE Biology · Cell Biology

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Question

Describe the structure of a cell membrane and explain how it controls the movement of substances in and out of the cell.

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✓ Model Answer

The cell membrane is a phospholipid bilayer with embedded proteins. It is selectively permeable — small, non-polar molecules pass freely, while larger or charged particles require transport proteins. Movement occurs via diffusion, osmosis, and active transport.

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