1) Which of the following is NOT a characteristic of enzymes ? a) They are biological catalysts. b) They are usually proteins. c) They are consumed in the reaction they catalyse d) They increase the rate of reaction 2) The region on an enzyme where the substrate binds is called the: a) Active site. b) Allosteric site.   c) Substrate site. d) Enzyme- substrate complex. 3) What affect does an enzyme have on the activation energy of a reaction? a) It increases the activation energy. b) It decreases the activation energy. c) It has no affect on the activation energy. d) It changes the activation energy, only in certain reactions. 4) Which of the following factors can affect enzyme activity? a) Temperature. b) pH. c) Substrate concentration. d) All of the above. 5) A competitive inhibitor: a) Binds to the allosteric site of an enzyme.   b) Binds to the active site of an enzyme, competing with the substrate. c) Changes the shape of the enzyme. d) All of the above. 6) What is induced-fit model of enzyme- substrate interaction? a) The enzyme and substrate have exactly complementary shapes. b) The enzyme changes shape slightly to better accommodate the substrate. c) The substrate changes shape to fit the enzyme. d) The enzyme and substrate remain unchanged during binding. 7) Enzymes are highly specific because: a) They have unique three- dimensional structure. b) Their active site are complementary to the shape of the substrate. c) They only interact with a limited range of substrates. d) All of the above.

Enzymes

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