A2 OCR Biology Key Terms and Definitions Respiration

1. A three-carbon molecule that is the end-product of glycolysis. (8)
4. A non-protein substance that is required for an enzyme to catalyse a reaction. (8)
6. The ‘background material’ inside a mitochondrion, where the link reaction and the Krebs cycle take place. (6)
9. A six-carbon compound that is involved in the Krebs cycle. (7)

2. The cycle of reactions that takes place in the matrix of a mitochondrion, in which pyruvate is oxidised to oxaloacetate; ATP, reduced NAD and reduced FAD are produced, and carbon dioxide is given off. (5, 5)
3. A six-carbon sugar with two phosphate groups attached. (6, 12)
5. The release of chemical energy from glucose or other substrates by oxidation; most of the energy is used to make ATP; it happens in all living cells. (11)
7. Nicotinamide adenine dinucleotide; a coenzyme that is required to allow dehydrogenases to remove hydrogens; the NAD accepts them and becomes reduced. (3)
8. An enzyme that can catalyse the conversion of ADP and Pi into ATP or the reverse reaction; sometimes known as ATP synthase. (6)
10. The chemical reactions that take place in living organisms. (9, 9)

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