Question

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

• A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
• B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
• C. If the assertion is true but the reason is false
• D. If both the assertion and reason are false
• E. If the assertion is false but reason is true

Answer 1

Answer: (B)

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

Phenylketonuria results when there is a deficiency of liver enzyme phenyl alanine hydroxylase that converts phenyl alanine into tyrosine. It results with a high level of phenyl alanine in blood, tissue fluids and urine.

So, the correct answer is 'If both the assertion and reason are true but the reason is not a correct explanation of the assertion'