IGCSE Quiz - 13 May
Enzymes catalyse reactions by
Lowering activation energy of the reaction
Lowering activity energy of the reaction
Lowering physical energy of the reaction
Lowering chemical energy of the reaction
Fats is digested by lipase into fatty acid and glycerol. Which of the following is correct?
Key = Lipase, Lock = Fats
Key = Fats, Lock = Lipase
Key = Fatty acid and glycerol, Lock = Fats
Key = Fats, Lock = Fatty acid and glycerol
Which of the following is correct about Lock and Key hypothesis?
Substrate's shape is complementary to that of enzyme and fits exactly
Substrate's shape is complementary to that of enzyme but does not fit exactly
Substrate's shape is not complementary to that of enzyme
Substrate's shape is complementary to that of enzyme and fits exactly, causing enzyme to change shape
Which of the following is correct about Induced Fit hypothesis?
Substrate's shape is complementary to that of enzyme and fits exactly
Substrate's shape is complementary to that of enzyme but does not fit exactly. Enzyme will change shape to fit substrate more tightly
Substrate's shape is not complementary to that of enzyme
Substrate's shape is complementary to that of enzyme and fits exactly, causing enzyme to change shape
The diagram shows how enzyme activity varies with temperature. Describe what happens in region D.
Enzymes are denatured
The bonds that give enzymes their unique shape are broken
Beyond the optimum temperature, rate of reaction decreases as temperature increases
Beyond the optimum temperature, activation energy decreases
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