# Explain why lipids are described as being made from fatty acids and glycerol, and why proteins are described as being made from amino acids.

> Pearson Edexcel International GCSE Biology (4BI1) — 2.3 Biological molecules · Explain · 4 marks

## Mark scheme (4 marks)

1. Lipids are made from / composed of fatty acid chains and glycerol
2. Lipids include fats and oils
3. Proteins are large molecules made up of / assembled from amino acids
4. Both lipids and proteins are large molecules / macromolecules built from smaller subunit molecules (fatty acids and glycerol for lipids; amino acids for proteins)

## Key terms

- [lipids](https://www.gradenine.co.uk/glossary/lipids)
- [fatty acids](https://www.gradenine.co.uk/glossary/fatty-acids)
- [glycerol](https://www.gradenine.co.uk/glossary/glycerol)
- [proteins](https://www.gradenine.co.uk/glossary/proteins)
- [amino acids](https://www.gradenine.co.uk/glossary/amino-acids)

## Related

- [Revision notes for Pearson Edexcel International GCSE Biology (4BI1)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-why-lipids-are-described-as-244f314b) · Published by Druglandscape Ltd.