Question

the class of enzyme that catalyzes addition of a group to a double bond is
○ hydrolases
○ oxidoreductases
○ lyases
○ ligases
○ transferases
○ isomerases

Explanation:

• Hydrolases: Catalyze hydrolysis reactions (breaking bonds with water), not addition to double bonds.
• Oxidoreductases: Catalyze oxidation - reduction reactions (transfer of electrons), not addition to double bonds.
• Lyases: Catalyze the addition of groups to double bonds or removal of groups to form double bonds. For example, carbon - carbon, carbon - oxygen, carbon - nitrogen double bonds.
• Ligases: Catalyze the joining of two molecules with the use of energy (usually from ATP), not addition to double bonds.
• Transferases: Catalyze the transfer of functional groups from one molecule to another, not addition to double bonds.
• Isomerases: Catalyze the rearrangement of atoms within a molecule (isomerization), not addition to double bonds.

Answer:

C. lyases