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NEET 2016 Phase 1 · BiologyPrevious Year Question

The correct statement regarding RNA and DNA, respectively is:

Answer: (B) The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.. Answer: (B) The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.

  1. A.The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose.
  2. B.The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.✓
  3. C.The sugar component in RNA is arabinose and the sugar component in DNA is ribose.
  4. D.The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose.

Correct Answer

(B) The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.

Solution & Explanation

Answer: (B) The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose. Solution: Both nucleic acids contain a pentose sugar in their nucleotides — ribose in RNA and deoxyribose (2'-deoxyribose) in DNA; the only difference is the –OH versus –H at the 2' carbon. Arabinose is not a component of either. NCERT Ch 5, p.80, lines 20-21: "a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group."

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