Biology · May / June 2016 · Paper 21 · Question 6
5090
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Enzyme Q is active in the human alimentary canal. Fig. 6.1 shows the effect of pH on the rate of reaction of enzyme Q. 0 0 20 40 60 80 100 1 2 3 4 5 pH rate of reaction / arbitrary units Fig. 6.1
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6(a)(i)[1]
stomach ; [1]
6(a)(ii)[6]
enzyme and substrate are lock and key ;
reference to optimum pH / (hydrochloric) acid (in stomach) ;
active site ;
complementary AW ;
substrate ;
if pH changes / alkaline ;
enzyme denatured / changes shape AW ; (substrate) no longer fits ; [max 6]
6(b)[3]
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