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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm270

Which description of the nucleotide shown is correct?

  1. ARibose, one phosphate on C-5', purine base: an RNA nucleotide
  2. B2-Deoxyribose, one phosphate on C-5', purine base: a DNA nucleotide
  3. CRibose, one phosphate on C-3', purine base: an RNA nucleotide
  4. DRibose, two phosphates on C-5', purine base: an RNA nucleotide

Answer: A

The sugar keeps the OH at C-2' so it is ribose (RNA series). A single phosphate (RDKit finds one P) is esterified to the CH2OH carbon, C-5', and the base is adenine, a purine. The nucleotide is adenosine 5'-monophosphate (AMP), an RNA monomer.
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