NEET Biology question

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

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

Phenylketonuria is indeed an autosomal recessive disorder caused by deficiency of the enzyme phenylalanine hydroxylase, which normally oxidises phenylalanine to tyrosine (Assertion is true); because this conversion fails, phenylalanine and its metabolic by-products accumulate and are excreted

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Question ID VK-119771