Which class of enzyme catalyzes a reaction where the chemical formula does not change?

• A. Isomerase.
• B. Oxidoreductase.
• C. Transferase.
• D. Ligase.

Answer: (A)

Verified step by step guidance

1. Understand the role of each enzyme class: Isomerases, Oxidoreductases, Transferases, and Ligases.
2. Isomerases catalyze reactions that involve the rearrangement of atoms within a molecule, resulting in isomers. The chemical formula remains unchanged.
3. Oxidoreductases are involved in oxidation-reduction reactions, where electrons are transferred between molecules, changing the chemical formula.
4. Transferases catalyze the transfer of functional groups from one molecule to another, altering the chemical formula.
5. Ligases catalyze the joining of two molecules, often requiring energy input, and result in a change in the chemical formula.