What is the role of competitive inhibitor during enzyme action?

It enhances enzyme action

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It declines enzyme action

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It alters the active site of the enzyme and prevents the binding of substrate

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It inhibits breaking of chemical bonds of the substrate

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Solution

The correct option is A It declines enzyme action
In competitive inhibition, a molecule similar to substrate competes with the substrate for the active site. Such molecules are known as an inhibitor. The presence of the inhibitor decreases availability of the active site for the substrate and further decreases the rate of reaction.
So, the correct answer is option B.

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Similar questions

Q. Assertion :Competitive inhibitors compete with the natural substrate for their attachment on the active sites of enzymes. Reason: In competitive inhibition, inhibitor binds to allosteric site of the enzyme.

Q. Arrange the steps of catalytic action of an enzyme in order and choose the right option.

(i)

Enzyme releases products of reaction and the enzyme is free to bind to another substrate.

(i i)

Active site of enzyme is in close proximity of substrate and breaks the chemical bonds of substrate.

(i i i)

Binding of substrate induces enzyme to alter its shape fitting more tightly around substrate.

(i v)

Substrate binds to active site of enzyme fitting into active site.

Q. Identify the wrong statemets.

(a)

The substrate binds to active site of enzyme and not fitting into active site

(b)

The binding of substrate induces the enzyme to alter its shape

(c)

Chemical bonds of substrate break down not to form new enzyme-product complex

(d)

The enzyme releases the products of the reaction and runs through catalytic cycle once again

Which of the following statements is not true about enzyme inhibitors?
(a) Inhibit the catalytic activity of the enzyme
(b) Prevent the binding of substrate
(c) Generally a strong covalent bond is formed between an inhibitor and an enzyme
(d) Inhibitors can be competitive or non-competitive

Q. Identify the wrong statements:

(A) The substrate binds to the active site of the enzyme and not fitting into the active site.
(B) The binding of the substrate induces the enzyme to alter its shape.
(C) Chemical bonds of the substrate does not break down to form new enzyme-product complex.
(D) The enzyme releases the reaction and runs through the catalytic cycle once again.

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