Enzymes speed up reactions in the body and this is why theyre called biological catalysts.
They catalys chemical reactions occuring in respiration, photosynthesis and protein synthesis of living cells.
The substrate molecule fits into the active sit of the enzyme, this explains why each enzyme can onky work on a particular substrate.
Enzymes work best at a particular temperature (body temp [37*c ish]) and pH. This is called the optimum.
- At low tempertatures molecules are moving slowly and so the enzyme and substrate are less likely to collide.
- At very high/low pH or high temperatures the enzymes active site changes shape, this is refered to as denaturing.
It is possible to work out how temperature alters the rate of reaction by calculating the temperature coefficient, called Q10. This is done for a 10*c change in temperature and by using
Q10 = rate at higher temperature/rate at lower temperature
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