Protein compound which brings about changes in other organic compounds without being changed or broken down itself

Enzymes

Enzymes are biological substances that catalyse chemical reactions and they regulate the rate at which chemical reactions peoceed without itself being altered in the process. However, enzymes act on the molecules called substrate and thereby convert them different molecules known as products.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.