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  1. Which one of the following statements in incorrect?
    1. In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.
    2. The competitive inhibitor does not affect the rate of breakdown of the enzymesubstrate complex.
    3. The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.
    4. A competitive inhibitor reacts reversibly with the enzyme to form an enzymeinhibitor complex.
Correct Option: C

Km increases but Vmax remains the same in competitive inhibition. This is because, on slightly increasing the substrate concentration, the effect of inhibitor is removed.


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