Assertion :Phenylketonuria is a recessive hereditary disease caused by body's failure to oxidize an amino acid phenylalanine to tyrosine, because of a defective enzyme. Reason: It results in the presence of phenylalanine acid in urine.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Phenylketonuria is a recessive hereditary disease caused due to the absence of enzyme phenylalanine hydroxylase that converts phenylalanine into tyrosine. It results in a high level of phenylalanine in blood tissue fluids and urine. Both the assertion and reason are true, but reason in not the correct explanation of assertion.

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Similar questions

Q. Assertion :Phenylketonuria is a recessive hereditary disease caused by failure of the body to oxidise an amino acid phenylalanine to tyrosine because of defective enzyme. Reason: It results in presence of phenylalanine in urine.

Q. Assertion: Phenylketonuria is a recessive hereditary disease caused by the body’s failure to oxidise an amino acid phenylalanine to tyrosine, because of a defective enzyme.
Reason: It results in the presence of phenylpyruvate in the urine.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Q. Assertion: The compressibility factor for

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and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason (R) Lewis acid polarises the bromine molecule.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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