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NEETChemistryBiomolecules

A molecule is formed by the attachment of the nitrogenous base uracil to the 1' position of a pentose sugar, which is further linked to phosphoric acid at its 5' position. Identify the pentose sugar present and the overall classification of the molecule.

Options

  1. A-D-2-deoxyribose and Deoxyribonucleotide
  2. B-D-ribose and Ribonucleoside
  3. C-D-ribose and Ribonucleotide
  4. D-D-2-deoxyribose and Deoxyribonucleoside

Correct answer

C. -D-ribose and Ribonucleotide

Step-by-step solution

Uracil is a pyrimidine base found exclusively in RNA. Therefore, the pentose sugar it attaches to must be -D-ribose, not -D-2-deoxyribose (which is found in DNA). A nucleoside is formed when a base is attached to the 1' position of a sugar. When this nucleoside is further linked to phosphoric acid at the 5' position of the sugar moiety, it forms a nucleotide. Since the sugar is ribose and the phosphate group is present, the entire molecule is classified as a ribonucleotide. Answer: -D-ribose and Ribonucleotide

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