Explain how different amino acids can combine to form proteins.

Different amino acids link together through peptide bonds to form polypeptide chains. The sequence and number of amino acids determine the structure and function of the resulting protein.

This question tests the understanding of protein synthesis and the role of amino acids as building blocks of proteins. It requires knowledge of how amino acids are linked and the significance of their sequence. This response is aligned to Polymerisation and naturally occurring polymers because it explains different amino acids can be combined in the same chain to produce proteins. (HT only) using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.