LABORATORY REVIEW
CELL RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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forms a permanent enzyme-substrate complex
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may be destroyed and resynthesized several times
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interacts with a specific type of substrate molecule
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reacts at identical rates under all conditions
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Detailed explanation-1: -The lock and key model of enzyme action is based on structural complimentarity between the substrate molecule and the enzyme active site. According to this model, the substrate molecule fits in the enzyme active site like a key fits in a lock.
Detailed explanation-2: -The ‘’lock and key” model of enzyme action illustrates that a particular enzyme molecule interacts with a specific type of substrate molecule. The lock is the enzyme and the key is the substrate. Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme).
Detailed explanation-3: -In the lock and key mechanism, the binding pockets for the substrates exist in full form in the free enzyme. The substrates readily bind and the reaction is driven because the active site has better complementarity to the transition state of the reaction than to the substrates at the ground state.