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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm273

Which row correctly describes the nucleotide shown?

  1. ADNA component; pyrimidine base; 2 hydrogen bonds with adenine
  2. BRNA component; pyrimidine base; 2 hydrogen bonds with adenine
  3. CRNA component; pyrimidine base; 3 hydrogen bonds with guanine
  4. DRNA component; purine base; 2 hydrogen bonds with adenine

Answer: B

The sugar has OH at C-2' so it is ribose (RNA); one phosphate is on C-5'. The base is a single six-membered ring with two C=O groups and no methyl, which is uracil, a pyrimidine. Uracil pairs with adenine through two hydrogen bonds. The nucleotide is uridine 5'-monophosphate.
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