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Biomolecules
Question
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The correct statement regarding RNA and DNA, respectively is

  • The sugar component in RNA is ribose and sugar component in DNA is 2' deoxyribose

  • The sugar component in RNA is arabinose and the sugar component in DNA is ribose

  • The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose

  • The sugar component in RNA is arabinose and the sugar component in DNA is 2' deoxyribose.

Answer

A.

The sugar component in RNA is ribose and sugar component in DNA is 2' deoxyribose

In DNA, two helically twisted strands connected together by steps. Each strand consists of alternating molecules of deoxyribose at 2'-position and phosphate groups. 
On another hand, in RNA, the pentose sugar has an identical structure with deoxyribose sugar except that there is an -OH group instead of -H on carbon atom2'. Hence it is only called ribose.

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