Biosynthesis and Degradation of Nucleotides MCQ

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• Adenosine deaminase deaminates adenosine to ____________
  ক

  Hypoxanthine

  খ

  Inosine

  গ

  Xanthine

  ঘ

  Guanosine
• Conversion of dUMP to dTMP is catalyzed by ____________
  ক

  Thymidylate synthase

  খ

  Dihydrofolate reductase

  গ

  Dihyhroorotase

  ঘ

  Cytidylate synthase
• CTP is formed from UTP by the action of ____________
  ক

  Adenylate kinase

  খ

  Aspartate transcarbamoylase

  গ

  Dihyhroorotase

  ঘ

  Cytidylate synthase
• Phosphorylation of AMP to ADP is promoted by ____________
  ক

  Adenylate kinase

  খ

  Aspartate transcarbamoylase

  গ

  Dihyhroorotase

  ঘ

  Cytidylate synthase
• In the first committed step of pyrimidine biosynthesis, the reaction is catalyzed by ____________
  ক

  Adenylate kinase

  খ

  Aspartate transcarbamoylase

  গ

  Dihyhroorotase

  ঘ

  Cytidylate synthase
• Which of the following is an important precursor in pyrimidine pathway?
  ক

  Glycine

  খ

  Aspartate

  গ

  Glutamine

  ঘ

  Leucine
• Which of the following is an important precursor in the purine pathway?
  ক

  Glycine

  খ

  Aspartate

  গ

  Glutamine

  ঘ

  Leucine
• The first intermediate with a complete purine ring is ____________
  ক

  Inosinate

  খ

  Formate

  গ

  Aspartate

  ঘ

  Glycine
• An amino group donated by glutamine is attached at C-1 of PRPP, this results in ____________
  ক

  5-phosphoribosylamine

  খ

  4-phosphoribosylamine

  গ

  3-phosphoribosylamine

  ঘ

  2-phosphoribosylamine