Enzymes are usually proteins , which act as biological catalysts to speed up chemical reactions without being consumed in the process. Some enzymes can also be RNA molecules (ribozymes), but the vast majority of enzymes are protein biomolecules composed of amino acid chains that form specific three- dimensional structures essential for their function.

Details on Enzyme Biomolecules

• Enzymes are proteins made up of one or more polypeptide chains, with their amino acid sequence determining their three-dimensional structure and catalytic activity.
• The active site of an enzyme, where substrate binding and reaction occur, is a small, highly specific region of the protein's structure.
• While proteins are dominant as enzymes, some enzymatic functions are carried out by catalytic RNA known as ribozymes, but enzymes are not made from lipids or carbohydrates.

Thus, enzymes are primarily proteins, with a small subset being RNA-based biomolecules.