Direct comparison
DNA vs RNA
DNA is the double-stranded store of an organism’s genetic instructions; RNA is a single-stranded working copy used to build proteins.
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Side-by-side comparison
| Dimension | DNA | RNA |
|---|---|---|
| Full name | Deoxyribonucleic acid. | Ribonucleic acid. |
| Number of strands | Two strands (a double helix). | One strand. |
| Sugar | Deoxyribose. | Ribose. |
| Bases used | A, T, C and G (uses thymine). | A, U, C and G (uses uracil instead of thymine). |
| Main job | Stores genetic instructions long-term. | Carries instructions and helps make proteins. |
| Where it is found | Mainly in the nucleus. | Made in the nucleus, works in the cytoplasm. |
| Stability | Very stable — a safe master copy. | Less stable — a short-lived working copy. |
| How long it lasts | Lasts the lifetime of the cell. | Often broken down soon after use. |
Master copy and working copy
A handy way to picture the pair is as a library reference book and a photocopy. DNA is the master reference — too valuable to take out of the nucleus, kept as a stable double helix that protects the genetic instructions. RNA is the photocopy: a single strand made from part of the DNA, carried out to the cell’s protein-building machinery and then discarded. The two are chemically very similar, differing mainly in one sugar (deoxyribose versus ribose) and one base (RNA swaps thymine for uracil). For the molecular detail of each, see the dedicated CASRAI life-sciences pages on DNA and RNA.
Common questions
FAQ
What is the simplest difference between DNA and RNA?+
DNA is double-stranded and stores genetic instructions long-term, while RNA is single-stranded and carries a working copy of those instructions to make proteins. DNA stays in the nucleus as a stable master copy; RNA is made from it and travels out to do a job, then is broken down. They also differ in one sugar and one base.
Why does RNA use uracil instead of thymine?+
RNA replaces the base thymine with a similar base called uracil. Uracil pairs with adenine just as thymine does, so the genetic message still copies correctly. Since RNA is a short-lived working copy rather than a long-term store, it does not need the extra chemical stability that thymine gives DNA, so uracil is sufficient.
Is RNA made from DNA?+
Yes. The cell copies a section of DNA into a strand of RNA in a process called transcription. The RNA carries that copied instruction out of the nucleus to where proteins are assembled. Because it is copied directly from the DNA, the RNA reflects the genetic message but in a single-stranded, portable form.
Going deeper
