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Question

The efficiency of an enzyme in catalyzing a reaction is due to its capacity_____________.

A
To form a strong enzyme-substrate complex
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B
To decrease the bond energy of all substrate molecules
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C
To change the shape of the substrate molecule
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D
To lower the activation energy of the reaction
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Solution

The correct option is C To lower the activation energy of the reaction
A catalyst is a substance, which increases the rate of reaction without itself being consumed at the end of the reaction, and the phenomenon is called catalysis. There are some catalysts which decrease the rate of reaction and such catalysts are called negative catalyst. Obviously, the catalyst accelerating the rate will be positive catalyst. However, the term positive is seldom used and catalyst itself implies positive catalyst.
Enzymes acts as catalyst for biological process and lower activation energy and it increases efficiency.
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