ANS:A - proteins

Enzymes belong to the category of proteins. Enzymes are biological catalysts that accelerate chemical reactions within living organisms by lowering the activation energy required for the reactions to occur. They are made up of chains of amino acids, which are the building blocks of proteins. The specific sequence and arrangement of amino acids in the enzyme's structure determine its function and specificity in catalyzing particular chemical reactions. Enzymes play crucial roles in various metabolic processes, including digestion, energy production, and cellular signaling.