A single enzyme cannot regulate a variety of reactions because of the binding specificity of the substrate and enzyme. option C is correct.
Key-lock Theory:
It states that the enzyme and substrate are as lock and key. As there is only one specific key of a lock. Same there is only a single substrate (Key) for the Enzyme (Lock).
This specificity is because of the specific structure of the enzyme that allow only a specific substrate to bind.
Therefore, a single enzyme cannot regulate a variety of reactions because of the binding specificity of the substrate and enzyme.
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