Home
Class 12
BIOLOGY
Assertion : Phenylpyruvic acid is excret...

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

A

If both A and R are true and R is the correct explanation of A.

B

If both A and R are true but R is not the correct explanation of A.

C

If A is true but R is false

D

A is false but R is true.

Text Solution

Verified by Experts

The correct Answer is:
C
Phenylketonuria is the inborn error in metabolism . This disease is associated with metabolic breakdown of phenylalanine . The disease occurs due to accumulation of phenylpyruvic acid and causes mental disorder.
Promotional Banner

Similar Questions

Explore conceptually related problems

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.

Read the following statement s and choose the correct option In phenylketonuria the affected person does not secrete the enzyme to convert phenylalanine to tyrosine (II)Possibility of male becoming haemophiliac is extremely rare (III) Sickle cell anaemia is caused by the substitution of glutamic acid by valine at fifth position of beta chain of haemoglobin (IV) Myotonic dystrophy is an autosomal dominant trait

Assertion :- In fish ammonia is excreted by diffusion through gill surface as ammonium ions. Reason :- Some amount of urea may be retained in the kidney matrix of some animals to maintain a desired osmolarity.

Assertion : Gibberellic acid increases the yield of malt from barley grain. Reason :Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzyme for mobilisation of reserve food.

State True of False (i) Hetrozygous female for haemophilia 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.

Assertion :- Carbonic acid is more formed inside the RBC's than the plasma. Reason :- An enzyme carbonic anhydrase is present inside the RBC's

Assertion : The first step in TCA cycle is the condensation of pyruvate with oxaloacetic acid and water. Reason : This reaction is catalysed by enzyme pyruvate synthase.

Assertion A beam of electron can pass undeflected through a region of E and B. Reason Force on moving charged particle due to magnetic field may be zero in some cases.

Individuals suffering from phenylketonuria lack an enzyme required for the conversion of