GATE 2026 ES – Question 17
Environmental Microbiology · Microbial Metabolism · 1 mark · Multiple choice
Which enzyme class cleaves C–C, C–O or C–N bonds by elimination to form double bonds or rings, or catalyzes addition to double bonds?
- Lyases
- Transferases
- Oxidoreductases
- Hydrolases
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Correct answer: (A) Lyases
Explanation
Lyases catalyze nonhydrolytic elimination or the reverse addition reaction. Transferases move functional groups, oxidoreductases catalyze redox reactions, and hydrolases cleave bonds using water. The elimination/addition description therefore identifies **lyases, A**.
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