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dna is deoxyribonucleic acid and rna is just ribousnucleic acid
Yes, haley is correct. Structurally, DNA appears as a 2 stranded double helix, while RNA is only a single strand. RNA contains the base Uracil, while DNA has Thymine.
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The difference in structure is as Ravus stated in terms of secondary structure. One group joined to the 2' ribose sugar ring is OH in RNA and H in DNA; I think this is why RNA is a bit less stable than DNA
I'd only add that much of the stability in double stranded DNA is provided by many relatively low energy hydrogen bonds between the bases. RNA doesn't have these (although in some cases RNA can be double stranded and can form similar hydrogen bonds with itself which provide similar stability) and so it has a much broader conformational search space.
DNA is doubles stranded, while RNA is single stranded
DNA is very long and contains many genes while RNA is short.
DNA stays inside the nucleus (in eukaryotes) but RNA can be in both the nucleus and the cytoplasm.
RNA has Uracil instead of Thymine.
RNA has Ribose as a sugar while DNA has deoxyribose.
There is more RNA in a cell than DNA.
DNA molescule last longer while RNA molescules are constantly made and broken down.