MHT CET · BIOLOGY · STD 11 - 6. Biomolecules

Identify the INCORRECT statement with reference to enzymes.

A Lock and key analogy for enzyme action is proposed by Emil Fischer.
B Induced Fit model for enzyme action is proposed by Koshland.
C Increase in substrate concentration decreases the velocity of enzyme activity.
D Protease is a purely proteinaceous enzyme.

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Answer & Solution

Correct Answer

(C) Increase in substrate concentration decreases the velocity of enzyme activity.

Step-by-step Solution

Detailed explanation

An increase in substrate concentration generally leads to an increase in the velocity of enzyme activity until a certain point, called the saturation point, where all enzyme moleculesare occupied. This is known as the saturation kinetics of enzyme activity.

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.

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