NEET2026ChemistryChapterActual
Which of the following combinations of a pentose sugar and a nitrogenous base is exclusively found in the structure of RNA?
Options
- A-D-2-deoxyribose and Thymine
- B-D-ribose and Thymine
- C-D-ribose and Uracil
- D-D-2-deoxyribose and Uracil
Correct answer
C. -D-ribose and Uracil
Step-by-step solution
RNA (Ribonucleic acid) is composed of a pentose sugar, phosphoric acid, and nitrogenous bases. The pentose sugar present in RNA is -D-ribose, whereas in DNA it is -D-2-deoxyribose. The nitrogenous bases found in RNA are Adenine (A), Guanine (G), Cytosine (C), and Uracil (U). Thymine (T) is found in DNA instead of Uracil. Therefore, the combination of -D-ribose and Uracil is exclusively found in the structure of RNA. Answer: -D-ribose and Uracil