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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm215

Which statements are correct?

  1. AAdenosine 5-prime monophosphate is a nucleotide in which one phosphate group is esterified to the 5-prime hydroxyl of ribose.
  2. BDeoxythymidine is a nucleoside made of thymine and 2-deoxyribose.
  3. CCytidine is a purine nucleoside.
  4. DIn ATP three phosphate groups are attached separately to C-2, C-3 and C-5 of ribose.

Answer: A, B

AMP is adenine + ribose + one phosphate on C-5, a nucleotide. Deoxythymidine is thymine + 2-deoxyribose with no phosphate, so a nucleoside. Cytosine is a pyrimidine. In ATP the three phosphates are linked in a chain to the 5-prime position, not separately.
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