Final answer:
Enzymes are biological catalysts that catalyze chemical reactions in living organisms by lowering the activation energy. They are usually made up of proteins and have specific shapes that allow them to bind to specific substrates.
Step-by-step explanation:
Enzymes are biological catalysts that catalyze (speed up) chemical reactions in living organisms. They are usually made up of proteins and have specific shapes that allow them to bind to specific substrates. Enzymes work by lowering the activation energy of a chemical reaction, thereby increasing the rate of the reaction. For example, the enzyme amylase catalyzes the breakdown of starch into sugar molecules.
Learn more about Enzymes and their role as catalysts