2025 biology aqa

what would you say are the best paragraphs that could be applied to almost anything

Enzymes are biological catalysts meaning they speed up chemical reactions within living organisms. They do this without being used up in the reaction themselves. Enzymes are essential for most biological processes, including digestion, metabolism, and DNA replication. Each enzyme has a specific shape and an active site that binds to a particular substrate, the molecule the enzyme acts upon. Factors like temperature, pH, and substrate concentration can affect how well enzymes work. High temperatures or extreme pH levels can cause enzymes to denature, meaning they lose their shape and can't function properly. Digestive enzymes like amylase, protease, and lipase break down food molecules into smaller parts.