# Starch, proteins and DNA are all examples of polymers found in living organisms. Explain what is meant by the terms 'monomer' and 'polymer', and name one monomer that makes up each of the three polymers listed.

> AQA A-Level Biology (7402) — 3.1.1 Monomers and Polymers · Explain · 5 marks

## Mark scheme (5 marks)

1. A monomer is a small / single molecule that is the building block of a polymer
2. A polymer is a large molecule made of many monomers joined together
3. Glucose is the monomer of starch
4. Amino acids are the monomers of proteins
5. Nucleotides are the monomers of DNA

## Key terms

- [monomer](https://www.gradenine.co.uk/glossary/monomer)
- [polymer](https://www.gradenine.co.uk/glossary/polymer)
- [starch](https://www.gradenine.co.uk/glossary/starch)
- [protein](https://www.gradenine.co.uk/glossary/protein)
- [DNA](https://www.gradenine.co.uk/glossary/dna)

## Related

- [Revision notes for AQA A-Level Biology (7402)](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/starch-proteins-and-dna-are-all-571da50e) · Published by Druglandscape Ltd.