A-LevelBiologyBiological moleculesOct/Nov 2020Paper 2 Q518 Marks
A molecule of collagen consists of three identical polypeptides that form a triple helix. The amino acid glycine forms one third of the amino acids in a collagen molecule. Fig. 5.1A shows a polypeptide molecule during protein synthesis. A molecule of glycine is shown just before it is added to the polypeptide. [Figure 5.1]
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