 
			 
			MCQOPTIONS
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				| 1. | Which of the following is the best evidence for the lock and key theory of enzyme action? | 
| A. | Compounds similar in structure to the substrate inhibit enzyme activity | 
| B. | Enzymes are found in living organisms and speed up certain reactions | 
| C. | Enzymes speed up reactions by definite amounts | 
| D. | Enzymes determine the direction of a reaction | 
| Answer» B. Enzymes are found in living organisms and speed up certain reactions | |