# Describe what happens when a substrate molecule binds to an enzyme and explain how the product is released.

> Cambridge International IGCSE Biology (0610) — 5.1 Enzymes · Describe · 4 marks

## Mark scheme (4 marks)

1. The substrate enters / binds to the active site of the enzyme
2. An enzyme-substrate complex is formed
3. The substrate is broken down (into products)
4. The product(s) are released and the enzyme is unchanged / can be reused

## Key terms

- [substrate](https://www.gradenine.co.uk/glossary/substrate)

## Related

- [Revision notes for Cambridge International IGCSE Biology (0610)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-what-happens-when-a-substrate-7b937241) · Published by Druglandscape Ltd.