Discussion
Consider the following statements about enzymes :
1. Enzymes increase the activation energy of a reaction.
2. Enzymes work at their optimum temperature and pH.
3. The activity of enzymes cannot be affected by other compounds.
4. Enzymes need to be used in excess compared to the reagent to catalyse the reaction.
How many of the above statements is/are correct ?
Answer: A
Only one statement is correct, so the answer is Only one.
Statement 2 is correct: each enzyme works best at a particular optimum temperature and pH, and its activity falls away on either side.
The other three are wrong. Enzymes speed reactions by lowering the activation energy, not raising it. Their activity can be changed by other compounds: inhibitors reduce it and activators or cofactors are needed by many enzymes. And enzymes are not consumed, so a very small amount relative to the substrate is enough; they are not used in excess.
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