Assertion :Each enzyme has a substrate binding site in its molecule which forms highly reactive enzyme- substrate complex. Reason: The enzyme-substrate complex is long- lived and dissociates into its product and unchanged enzyme.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
A particular substrate molecule is acted upon by a particular enzyme. After coming in contact with the active site (a pocket into which the substrate fits) of the enzyme, the substrate molecules or reactants from a complex called enzyme - substrate complex. The enzyme substrate complex is short lived in the complexed state. the molecules of the substrate undergo chemical change. The product remain attached to the enzyme for some time so that an enzyme - product complex is also formed. However, the product are soon released and the freed enzyme is able to bind more substrate molecules.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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Similar questions

Assertion and Reason
In the following questions a statement of assertion (A) followed by a statement reason (R) is given. Choose the correct answer out of the following choice..
(a) Assertion and reason both are correct statements but reason does not explain assertion.
(b) Assertion and reason both are correct and reason explains asssWon.
(c) Both assertion and reason are Wrong statements.
(d) Assertion is correct statement reason is wrong statement.
(e) Assertion is wrong statement reason is correct statement.

Assertion (A) Enzymes have active sites that hold substrate molecule for a chemical reaction.
Reason (R) Drugs compete with natural substrate by attaching covalently to the active site of enzyme.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are correct statements and reason explains the assertion.
(b) Both assertion and reason are wrong statements.
(c) Assertion is correct statement and reason is wrong statement.
(d) Assertion is wrong statement and reason is correct statement.
(e) Assertion and reason both are correct statements but reason does not explain assertion.
Assertion (A) In presence of enzyme, substrate molecule can be attacked by the reagent effectively.
Reason (R) Active sites of enzymes hold the substrate molecule in a suitable position.

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

Assertion (A) Non-competitive inhibitor inhibits the catalytic activity of enzyme by binding with its active site.
Reason (R) Non-competitive inhibitor changes the shape of the active site in such a way that substrate can't recognise it.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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