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Question

The ratio of enzyme to substrate molecules can be as high as

A
1:100,000
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B
1:50,000
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C
1:10,000
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D
1:1,000
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Solution

The correct option is B 1:100,000
The enzyme attaches to the active site of the substrate. On attachment to the active site, the substrate is changed into the product. The active site has a residue which helps in the attachment of substrate. The substrate molecules form a temporary bond with the enzyme at the active site. The ratio of enzyme to substrate molecules can be as high as 1 : 100,000. If the amount of substrate increases more than this, it will not get the vacant active site for attachment which terminates the reaction.
So, the correct answer is option A.

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