1) What is the difference between the lock and key model and induced fit model? a) Enzyme changes structure to better fit the substrate in the induced fit b) Substrate changes shape to fit into the enzyme in the lock and key c) The enzyme changes structure to fit into the active site of the substrate in the induced fit 2) How is an enzyme an example of a biological catalyst? a) All proteins are enzymes, and they don't change shape during a reaction b) Enzymes are proteins that are unchanged at the end of the reaction 3) What happens to enzymes at high temperatures? a) Enzymes are denatured b) Enzymes are killed c) Enzymes work at the same rate 4) All enzymes work at the same temperature range a) True b) False 5) Enzymes have different optimal pH a) False b) True 6) Explain what is happening at the start of the graph a) Enzymes are gaining kinetic energy and more collisions occur between enzymes and substrates b) Enzymes regain their structure and are able to catalyse susbtrate 7) Using the graph explain how enzymes function a) The substrate active site binds to the enzyme b) The enzymes offer an alternative reaction with a lower activation energy 8) What are competitive inhibitors? a) Substance that changes the enzyme active site b) Substance with the same shape as the active site c) Substances that reduce the concentration of enzymes d) Substance that have a complementary structure to the active site 9) What is the difference between non competitive and competitive inhibition? a) Non competitive binds an alternative site on the enzyme. b) Competitive inhibitors bind to the active site preventing the enzyme-substrate complex c) Increasing substrate concentration affects competitive inhibition but not non competitive inhibition d) All three

Enzymes

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