Enzymes are biocatalysts. They catalyze biochemical reactions. In general, they reduce the activation energy of reactions. Many physicochemical processes are enzyme-mediated. Which of the following reactions is not enzyme-mediated in the biological system?
| 1. | Dissolving CO2 in water |
| 2. | Untwining the two strands of DNA |
| 3. | Hydrolysis of sucrose |
| 4. | Formation of peptide bond |
Page 155, XI NCERT
