Enzymes 2) Enzymes A) are composed of long chains of fatty acids. B) can be destroyed by variations in temperature or pH. C) are used up, in the process of performing a chemical reaction. D) raise the amount of energy required to start a chemical reaction.

The answer is B, can be destroyed by variations in the temperature.

Answer A is not correct because enzymes are made from protein, not fatty acids.

Answer C is not correct because enzymes are reusable, as their shape of the active site is not hanged by the reaction, thus having the ability to bind into other substrates again and again.

D is not correct because enzymes actually provide a pathway to start a reaction with a lower activation energy, therefore, it does not raise the amount of activation energy.

Answer B is correct because enzymes can be affected by temperature and pH, each type of enzyme only work the fastest at a specific temperature and pH, once the temperature is too high or he pH is too extreme, the active site of the enzyme is altered and thus cannot bind into substrates again. We can them denatured.

Answer: The answer is B