The statement that is true about all enzymes is:
d. They work on a single set of substrates.
Enzymes are highly specific biological catalysts that typically work on a particular substrate or a group of closely related substrates. Each enzyme has a shape that is complementary to its specific substrate, which allows it to catalyze a specific reaction. The other statements provided are not accurate for all enzymes:
- a. They catalyze a variety of different reactions. (This is not true; enzymes are generally specific to particular reactions.)
- b. They change the amount of energy released at the end of a reaction. (Enzymes do not change the overall free energy of the reaction; they lower the activation energy required for the reaction to occur.)
- c. They break down immediately following the reaction it catalyzes. (Enzymes can be reused and are not broken down after a single reaction.)