What are the lock and key and induced fit models for enzyme catalysis? why do they both have validity?

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What are the lock and key and induced fit models for enzyme catalysis? why do they both have validity?



the lock and key is when an enzyme active site is an exact complement to the substrate at all times and the substrate fits immediately in the active site like a key in the lock. Induced fit is when the shape of the active site changes in the presence of the substrate to yield a precise fit, all enzymes undergo some changes when the substrate is bound.

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