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87
MCQ (Single Correct Answer)

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.

A
Assertion and reason both are correct statements but reason does not explain assertion.
B
Assertion and reason both are correct and reason explains the assertion.
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.
88
MCQ (Single Correct Answer)

Assertion (A) Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles.

Reason (R) Chemicals enter the cell through receptor.

A
Assertion and reason both are correct statements but reason does not explain assertion.
B
Assertion and reason both are correct and reason explains the assertion.
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.
89
MCQ (Single Correct Answer)

Assertion (A) Transparent soaps are made by dissolving soaps in ethanol.

Reason (R) Ethanol makes things invisible.

A
Assertion and reason both are correct statements but reason does not explain assertion.
B
Assertion and reason both are correct and reason explains the assertion.
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.
90
MCQ (Single Correct Answer)

Assertion (A) Sodium chloride is added to precipitate soap after saponification.

Reason (R) Hydrolysis of esters of long chain fatty acids by alkali produces soap in colloidal form.

A
Assertion and reason both are correct statements but reason does not explain assertion.
B
Assertion and reason both are correct and reason explains the assertion.
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.
91
MCQ (Single Correct Answer)

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.

A
Assertion and reason both are correct statements but reason does not explain assertion.
B
Assertion and reason both are correct and reason explains the assertion.
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.
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