Question

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

• A. If both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
• B. If both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
• C. If Assertion is true, but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (B)

Phenylketonuria is due to deficiency of liver enzyme. Phenylalanine hydroxylase which converts phenylalanine into tryosine. It occurs in persons who are homozygous recessive. It results with a high level of phenylalanine in blood, tissue fluids and urine.