Friday, September 30, 2016

Protein Questions Online Test 12

Potein Questions Online Test 12
1. In urea synthesis, the amino acid functioning solely as an enzyme activator:
  • N-acetyl glutamate
  • Ornithine
  • Citrulline
  • Arginine


2. The enzyme carbamoyl phosphate synthetase requires
  • Mg++
  • Ca++
  • Na+
  • K+


3. Control of urea cycle involves the enzyme:
  • Carbamoyl phosphate synthetase
  • Ornithine transcarbamoylase
  • Argininosuccinase
  • Arginase


4. Transfer of the carbamoyl moiety of carbamoyl phosphate to ornithine is catalysed by a liver mitochondrial enzyme:
  • Carbamoyl phosphate synthetase
  • Ornithine transcarbamoylase
  • N-acetyl glutamate synthetase
  • N-acetyl glutamate hydrolase


5. A compound serving a link between citric acid cycle and urea cycle is
  • Malate
  • Citrate
  • Succinate
  • Fumarate


6. The 2 nitrogen atoms in urea are contributed by
  • Ammonia and glutamate
  • Glutamine and glutamate
  • Ammonia and aspartate
  • Ammonia and alanine


7. In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce
  • Serotonin
  • Histamine
  • Tryptamine
  • Tyrosine

8. Tryptophan could be considered as precursor of
  • Melanotonin
  • Thyroid hormones
  • Melanin
  • Epinephrine


9. Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires
  • NAD
  • FAD
  • ATP
  • Tetrahydrobiopterin


10. The rate limiting step in the biosynthesis of catecholamines is
  • Decarboxylation of dihydroxyphenylalanine
  • Hydroxylation of phenylalanine
  • Hydroxylation of tyrosine
  • Oxidation of dopamine

Potein Questions Online Tes

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