NEET BIOLOGY

Detailed explanation-1: -The enzymes that catalyze cellular reactions are macromolecules called proteins.

Detailed explanation-2: -Proteins contain the elements carbon, hydrogen, and oxygen just as carbohydrates and lipids do, but proteins are the only macronutrient that contains nitrogen. In each amino acid the elements are arranged into a specific conformation around a carbon center.

Detailed explanation-3: -Enzymes are another type of protein, and these molecules catalyze the biochemical reactions that occur in cells.

Detailed explanation-4: -A fundamental task of proteins is to act as enzymes-catalysts that increase the rate of virtually all the chemical reactions within cells. Although RNAs are capable of catalyzing some reactions, most biological reactions are catalyzed by proteins.