# Compare active transport with diffusion, stating two differences between the two processes.

> Cambridge International IGCSE Biology (0610) — 3.3 Active transport · Compare · 4 marks

## Mark scheme (4 marks)

1. Active transport moves substances against the concentration gradient, whereas diffusion moves substances down the concentration gradient.
2. Active transport requires energy from respiration, whereas diffusion does not require energy from respiration (it uses kinetic energy of the molecules).
3. Active transport uses carrier proteins to move substances across the membrane, whereas diffusion does not require carrier proteins.
4. The comparison must be clearly made — the answer must explicitly contrast both processes for the point to gain the mark (e.g. a named difference is stated for both active transport AND diffusion, not just one).

## Key terms

- [active transport](https://www.gradenine.co.uk/glossary/active-transport)
- [diffusion](https://www.gradenine.co.uk/glossary/diffusion)

## Related

- [Revision notes for Cambridge International IGCSE Biology (0610)](https://www.gradenine.co.uk/learn)
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Source: [GradeNine](https://www.gradenine.co.uk/q/compare-active-transport-with-diffusion-stating-de761cef) · Published by Druglandscape Ltd.