enzyme biology definition
Enzyme. Enzymes are proteins that catalyze (i.e. accelerate) chemical reactions.[1] In enzymatic reactions, the molecule s at the beginning of the process are called substrate s, and the enzyme converts them into different molecule s, the products. Enzymes. Enzymes are catalysts. Most are proteins. biological macromolecule that acts as a catalyst. Most enzymes are proteins, but certain RNAs, called ribozyme s, also have catalytic activity. Enzymes and Metabolism. 1) Enzymes are proteins which catalyze reactions in cells.