Glycine is H2NCH2COOH\text{H}_2\text{NCH}_2\text{COOH}H2NCH2COOH. Which formula shows the repeating unit of the polypeptide formed when glycine polymerises?
H2NCH2CO\text{H}_2\text{NCH}_2\text{CO}H2NCH2CO
H2NCH2COOH\text{H}_2\text{NCH}_2\text{COOH}H2NCH2COOH
HNCH2CO\text{HNCH}_2\text{CO}HNCH2CO
HNCH2COOH\text{HNCH}_2\text{COOH}HNCH2COOH
40 exam-style questions on AQA GCSE Chemistry 7.3 Synthetic and naturally occurring polymers, covering 7.3.1 Addition polymerisation, 7.3.2 Condensation polymerisation, 7.3.3 Amino acids, and 7.3.4 DNA (deoxyribonucleic acid) and other naturally occurring polymers. Each one has a worked solution and a mark scheme showing where the marks go.