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 correct and R is the correct explanation Of A

B

Both Assertion and reason are correct, but Reason is not the correct explanation of Assertion

C

Assertion is Correct, but Reason is Incorrect

D

Both Assertion and Reason are Incorrect

Text Solution

Verified by Experts

The correct Answer is:
B
Phenylketonuria is due to defeciency of liver enzyme phenylalanine hydroxylase, which converts phenylalanine into tyrosine.It occurs in person , who are homozygous recessive. It results with a high level of phenylalanine in blood, tissue fluids and urine
Promotional Banner

Topper's Solved these Questions

  • HUMAN GENETICS

    ARIHANT NEET|Exercise Chapter Exercise Medical entrances special format questions (Statement Based )|11 Videos

  • GROWTH, REGENERATION AND AGEING

    ARIHANT NEET|Exercise Chapter exercises (Medical entrances gallery)|11 Videos

  • HUMAN HEALTH AND DISEASES

    ARIHANT NEET|Exercise CHAPTER EXCERCISES ((B) MEDICAL ENTRANCES GALLERY (COLLECTION OF QUESTIONS ASKED IN NEET & VARIOUS MEDICAL ENTRANCE EXAMS))|42 Videos

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.

ARIHANT NEET-HUMAN GENETICS-Chapter Exercise (c) Medical entrances gallery (Collection of questions asked in NEET & Various Medical Entrance Exams)
  1. A marriage between normal visioned man and colour blind woman will pr...

    Text Solution

    |

  2. Sickle cell anamia has not been eleiminated from African polulation as

    Text Solution

    |

  3. Which of these is not a Mendian disorder ?

    Text Solution

    |

  4. Gene for colour blindness is located on:

    Text Solution

    |

  5. Identify a Mendelian disorder from the following

    Text Solution

    |

  6. A man a inherit his X chromosome from

    Text Solution

    |

  7. Excessive growth fo hair one the pinna is a feature found only in male...

    Text Solution

    |

  8. Assertion : Phenylketonuria is a recessive hereditary disease caused b...

    Text Solution

    |

  9. Which of the following is not a hereditary disease

    Text Solution

    |

  10. Which of the following disease results from the genetic inability to ...

    Text Solution

    |

  11. Down's syndrome and Turner's syndrome occur in human being due to

    Text Solution

    |

  12. A diseased man marries a normal woman and they get three daughters and...

    Text Solution

    |

  13. Haemophilia, an X-linked recessive disease is caused due to deficiency...

    Text Solution

    |

  14. A person is suffering from disease phenylketonuria, Which is an autoso...

    Text Solution

    |

  15. Which of the following is the example of sex-linked disease?

    Text Solution

    |

  16. If a character is always transmitted directly from a father to all his...

    Text Solution

    |

  17. X-chromosome of female in a sex - linked inheritance case can be passe...

    Text Solution

    |

  18. Pattern baldness, moustanches and beard in human males are examples of...

    Text Solution

    |

  19. A couple has 6 children, 5 are girl and 1 is boy. The percentage of h...

    Text Solution

    |

  20. When released from ovary human egg contain

    Text Solution

    |