2. An enzyme is primarily made of: a. carbohydrates b. proteins c. nucleic acids d. lipids

The correct answer is b. proteins.<br /><br />Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are primarily composed of proteins, which are large, complex molecules made up of amino acids. Proteins are essential for the structure, function, and regulation of the body's tissues and organs. Enzymes play a crucial role in various biological processes, such as digestion, metabolism, and DNA replication. While carbohydrates, nucleic acids, and lipids are important biomolecules, they do not form the primary structure of enzymes.