Question

Assertion : Phenylpyruvic acid is excreted through urine in case of phenylketonuria.
Reason : The affected individual lacks enzyme phenylalanine hydroxylase.

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

Answer 1

Answer: (A)

Phenylketonuria is an inherited error of metabolism caused by a deficiency in the enzyme phenylalanine hydroxylase. It is an autosomal recessive trait. It is a hereditary human condition resulting from the inability to convert phenylalanine into tyrosine. This leads to over production of phenylalanine and its conversion to phenylpyruvic acid and other derivatives. These are then excreted in urine due to poor absorption by kidneys.