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Standard XI
Biology
Mechanism of Enzyme Action
Which of the ...
Question
Which of the following representation shows the correct steps in catalytic reaction of an enzyme?
A
E + S
→
E + P
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B
E + S
→
ES
→
E + P
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C
E + S
→
EP
→
E + P
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D
E + S
→
ES
→
EP
→
E + P
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Solution
The correct option is
D
E + S
→
ES
→
EP
→
E + P
The catalytic reaction of an enzyme can be described in the following steps:
E + S
→
ES
→
EP
→
E + P
Substrate binds to the active site of enzyme.
Formation of enzyme-substate complex.
Formation of enzyme-product complex.
Release of product from the enzyme.
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I. The enzyme release the products of the reaction and the enzyme is free to bind to another substrate.
II. The active site of enzyme is in close proximity of the substrate and breaks the chemical bonds of the subtrate.
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The catalytic cycle of an enzyme action can be described by the steps given below:
(A) The active site of enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate and the new enzyme-product complex is formed.
(B) The binding of the substrate induces the enzymes to alter its shape, fitting more tighty around the substrate.
(C) The substrate binds to the active site of the enzyme, fitting into the active site.
(D) The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate and run through the catalytic cycle once again.
Arrange them in the correct sequence.
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