what is the sugar in rna

The sugar in RNA is ribose , a five‑carbon (pentose) sugar that forms part of each RNA nucleotide and makes up the RNA backbone.

Quick Scoop

1. Straight answer

• The sugar in RNA is called ribose.

• It’s a five-carbon sugar (a pentose) with the formula C5H10O5.

2. Why ribose matters

• Ribose has an –OH (hydroxyl) group on its 2′ carbon, which makes RNA more reactive and less stable than DNA.

• That extra reactivity suits RNA’s more temporary jobs in the cell, like carrying messages (mRNA) and helping build proteins (tRNA, rRNA).

3. Quick comparison with DNA

• RNA: sugar is ribose (with 2′‑OH).

• DNA: sugar is deoxyribose , which lacks that 2′‑OH (it has H instead).

• This small structural difference helps DNA stay more stable for long‑term information storage, while RNA stays more flexible and short‑lived.

You can even see it in the name: Ribo nucleic acid → ribose is the sugar in RNA.

TL;DR: The sugar in RNA is ribose, a five‑carbon sugar whose extra –OH group makes RNA more reactive and less stable than DNA.

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