question_answer 29)

  Which of the following reactions is not enzyme mediated in biological system? (a) Dissolving CO^ in water                                          (b) Unwinding the two strands of DNA (c) Hydrolysis of sucrose                                               (d) Formation of peptide bond

Answer:

                  (a)gets dissolved in water, a reaction which is not always catalyzed by any enzyme. Unwinding and winding of the two strands of DNA is catalyzed by the enzymetopoisomerase. Hydrolysis of sucrose is regulated by sucrase. Peptide bonds areformed by the action of enzyme peptidyl transferase.