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Choose the Best Answer · Q9

Q.The correct statement regarding RNA and DNA respectively is (NEET Phase – I)

a) the sugar component in RNA is an arabinose and the sugar component in DNA is ribose
b) the sugar component in RNA is 2’-deoxyribose and the sugar component in DNA is arabinose
c) the sugar component in RNA is an arabinose and the sugar component in DNA is 2’-deoxyribose
d) the sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose
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Step 1. Recall the two pentose sugars named for nucleic acids in §14.5.1: RNA's nucleotides contain D-ribose, and DNA's nucleotides contain 2'-deoxy-D-ribose (ribose with the 2'-OH replaced by a plain -H).

Step 2. Options (a), (b) and (c) all substitute 'arabinose' for one sugar or the other -- arabinose is a real pentose, but it is not the sugar used in either DNA or RNA, so all three options are factually wrong on that point alone; (b) additionally reverses which nucleic acid has the d …

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