Backbone of RNA molecule contain sugar

Ribose

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Rhamnose

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Deoxyribose

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Ribulose

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Solution

The correct option is A Ribose
RNA is ribonucleic acid. It is a polymer of ribonucleotides. Ribonuleotides are phosphoric acid esters of ribonuceosides. The ribonucleosides are formed from pentose sugar ribose and nitrogenous bases which can be purine (adenine or guanine) or pyrimidine (cytosine or uracil).

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