# Amino acids can join together by condensation polymerisation to form polypeptides. Explain what is meant by the terms 'condensation polymerisation' and 'polypeptide', and state what type of molecules make up DNA.

> AQA A-Level Chemistry (7405) — 3.3.13 Amino acids, proteins and DNA (A-Level only) · Explain · 5 marks

## Mark scheme (5 marks)

1. Condensation polymerisation involves monomers joining together to form a polymer
2. During condensation polymerisation, a small molecule (such as water) is lost/released
3. Condensation polymerisation requires monomers with two functional groups
4. A polypeptide is a chain of amino acids
5. DNA is made from nucleotides (as its monomers)

## Key terms

- [condensation polymerisation](https://www.gradenine.co.uk/glossary/condensation-polymerisation)
- [polypeptide](https://www.gradenine.co.uk/glossary/polypeptide)
- [amino acids](https://www.gradenine.co.uk/glossary/amino-acids)

## Related

- [Revision notes for AQA A-Level Chemistry (7405)](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)

---
Source: [GradeNine](https://www.gradenine.co.uk/q/amino-acids-can-join-together-by-9dddf8a7) · Published by Druglandscape Ltd.