Biology GCSE key terms 0.0 / 5 ? BiologyBiologyIGCSEEdexcel Created by: sandpitturtleCreated on: 14-09-13 23:27 4235617 Across 1. The energy needed to start a chemical reaction (10) 7. The temperature and pH at which an enzyme-catalyzed reaction proceeds at the fastest rate (7) Down 2. The state of an enzyme when it has been irreversibly damaged and has changed shape (9) 3. The part of the enzyme into which the reactant molecule fits, ...... site (6) 4. The series of reactions that release energy from glucose, in the presence of oxygen (11) 5. A substance that changes the rate of reaction without being used up (8) 6. A biological catalyst (6)
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