c. factors affecting enzyme activity

Enzymes are biological catalysts because they speed up chemical reactions without being affected themselves. They are composed of protein and have an active site, which is complementary in shape to the enzymes substrate. The primary structure of enzymes is a chain of amino acids linked by peptide bonds, this chain is called a polypeptide chain, and the secondary structure is where the chain folds to form the alpha helix. This folding is allowed by hydrogen bonds.

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