# Explain how the structure of the cell membrane allows it to control the movement of substances in and out of the cell.

> OCR GCSE Biology A: Gateway Science (J247) — B1 Cell level systems · Explain · 4 marks

## Mark scheme (4 marks)

1. The cell membrane is semi-permeable
2. Phospholipid bilayer structure contributes to its function
3. Embedded proteins facilitate transport across the membrane
4. Regulation of substance movement is crucial for cell function

## Related

- [Revision notes for OCR GCSE Biology A: Gateway Science (J247)](https://www.gradenine.co.uk/learn)
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