Respiration (OCR GCSE Biology A (Gateway Science Suite)): Revision Notes
📚 Revision Notes
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:
- Glucose molecules being converted to starch, glycogen and cellulose by being\ joined together
- A glycerol molecule and three molecules of fatty acids forming a lipid molecule
- Glucose and nitrate ions forming amino acids, which are used to form proteins
- The reactions in respiration
- Urea forming from the breakdown of proteins for excretion