Which type of biological macromolecule are enzymes predominantly?

Enzymes are predominantly proteins, which are a type of biological macromolecule made up of long chains of amino acids. These proteins play a critical role in catalyzing biochemical reactions, lowering the activation energy required for reactions to occur, and thus increasing the rate at which they proceed. The specific structure of proteins allows for the formation of an active site, which binds to substrate molecules and facilitates their conversion into products.

Proteins differ from other types of macromolecules such as nucleic acids, which are involved in the storage and transmission of genetic information; carbohydrates, which primarily serve as energy sources and structural components; and lipids, which are hydrophobic molecules that are key components of cell membranes and serve various metabolic functions. Each of these macromolecules has distinct roles in biological systems, but enzymes are classified specifically as proteins due to their composition and functional properties.