Given below are the statements regarding enzymes.
Choose the correct statements.
i. All enzymes are proteinaceous.
ii. Enzyme becomes more active at the temperature of 60° to 70° С. Enzymes have one or two active sites where substrate binds with the enzyme.
iv. Any increase or decrease in specific pH, enzyme activity is always enhanced. Enzymes remain active to catalyze again after completion of first reaction.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.