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12th Class Chemistry Biomolecules / जैव-अणु Question Bank MCQs - Biomolecules

  • question_answer
    The correct statement regarding RNA and DNA, respectively is

    A) The sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose

    B) The sugar component in RNA is arabinose and the sugar component in DNA is ribose

    C) The sugar component in RNA is 2’-deoxy ribose and the sugar component in DNA is arabinose

    D) The sugar component in RNA is arabinose and the sugar component in DNA is  2’-deoxyribose

    Correct Answer: A

    Solution :

    [a]
    In DNA, two helically twisted strands are connected together by hydrogen bonding. Each strand consists of alternating molecules of deoxyribose at 2’-position and phosphate groups.
    \[\therefore \] The sugar component is 2’-deoxyribose.
    On the other hand, in RNA, the pentose sugar has an identical structure with deoxyribose sugar except that there is an \[OH\] group present instead of \[H\] on carbon atom 2’. Hence, it is only called ribose.


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