Final answer:
Enzymes use various catalytic mechanisms and exhibit specificity in their reactions.
Step-by-step explanation:
Enzymes use several types of catalytic mechanisms. One mechanism involves the action of the enzyme's active site, which includes structural features like shape and conformation. Another mechanism involves the energetic aspects of enzyme action, specifically how enzymes lower the activation energy of a chemical reaction. Enzymes can also exhibit specificity, where they either act on one specific substrate or catalyze one particular reaction. Enzymes are classified based on the type of reaction they catalyze, such as oxidoreductases, transferases, hydrolases, lyases, isomerases, and ligases. They can also utilize mechanisms like covalent catalysis. Overall, enzymes have specific catalytic mechanisms and can exhibit substrate specificity in their reactions.