NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A lock and key is sometimes used as a model to promote understanding of enzymes. Which characteristic of enzymes or their action is best illustrated by this model?
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The sensitivity of enzymes to changes in pH
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The change in activation energy the enzymes cause
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The specificity of fit between an enzyme and a substrate
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The increase in reaction rate due to the action of the enzyme
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Explanation:
Detailed explanation-1: -The active site of enzyme is highly specific for its substrate . The enzyme and substrate fit like a lock and key and thus is a lock and key model of enzyme action. However, sometimes other molecules which are similar to the substrate can also combine with the active site of an enzyme.
Detailed explanation-2: -The lock and key model of enzyme action proposes that the substrate fits into the active site of the enzyme like a key into a lock. This specific binding allows the enzyme to lower the activation energy of the reaction, making it more likely to occur.
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