Home
Class 12
BIOLOGY
Assertion : Phenylketonuria is a recessi...

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 acid in the urine .

A

Both (A ) and (R ) are true and (R ) is the cerrect explanation of (A )

B

Both (A ) and (R ) are true and (R ) is not the cerrect explanation of (A )

C

(A) is true statement but ( R) is flase

D

Both (A ) and ( R )are false

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

[A]: PKU is a autosomal recessive hereditary metabolic disease caused by the body's fail- ure to oxidise an amino acid (Phenylalanine) to tyrosine because of a defecitve enzyme. [R]: It resulted the presence of phenylpyruvic acid in the urine.

The ezyme which changes amino acid phenylalanine to amino acid tyrosine is

The amino acid, phenylalanine is poorly soluble in water because its side chain or R group is

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

A person affected with phenylketonuria lacks an enzyme that converts the amino acid phenylalanine into :

Assertion : Phenylketonuria, Haemophilia and sickle cell anemia are genetic disorders. Reason : In phenylketonuria the person has a non-functional enzyme for the conversion of phenylalanine to tyrosine.

Assertion : All proteinaceous enzymes have a three dimensional structure Reason : The secondary struture of protein is according to amino acids present inside the polypeptide

Assertion : Iodination of alkane is carried out in presence of iodic acid. Reason : Iodine is an oxidizing agent.

State True of False (i) Hetrozygous female for baemophilia may transmit the disease to sons (ii) Affected individuals with phenylketonuna lack an enzyme that converts the amino acid phenylalanine into phenylpyruvic acid (iii) Klinefelter's syndrome is caused due to the presence of an additional copy of X-chromosome resulting into a karyotype of 47//XXX (iv) Failure of segregation of homologous pair of chromosomes during cell division cyclic results in Turner's syndrome.