Chapter 21, Problem 21.33EP

Indicate whether each of the following statements concerning enzymes and their mode of action are true or false.

1. a. According to the lock-and-key model of enzyme action, the active site of an enzyme is flexible in shape.
2. b. In an enzyme-catalyzed reaction, the compound that undergoes a chemical change is called the substrate.
3. c. The nonprotein portion of a conjugated enzyme is the enzyme’s active site.
4. d. Simple enzymes have inorganic cofactors, and conjugated enzymes have organic cofactors.