Last Updated Sep 26, 2025

Metabolism Simplified Revision Notes for GCSE AQA Biology Combined Science

Revision notes with simplified explanations to understand Metabolism quickly and effectively.

Learn about Respiration for your GCSE Biology Combined Science Exam. This Revision Note includes a summary of Respiration for easy recall in your Biology Combined Science exam

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4.2.3 Metabolism

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Metabolism is the sum of all the reactions in a cell or the body. The energy transferred in the cells by respiration is used in the processes of metabolism to make new molecules. These processes are controlled by enzymes.

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Examples of metabolic reactions:

1. Glucose molecules being converted to starch, glycogen and cellulose by being\ joined together
2. A glycerol molecule and three molecules of fatty acids forming a lipid molecule
3. Glucose and nitrate ions forming amino acids, which are used to form proteins
4. The reactions in respiration
5. Urea forming from the breakdown of proteins for excretion

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