thymine
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Uracil is the nitrogenous base that is found on RNA but not on DNA. RNA contains uracil instead of thymine, which is found in DNA.
In RNA, the base T is replaced with the nucleotide U (uracil).
In DNA thymine is one of the nitrogen bases, but in RNA uracil replaces thymine still leaving four nitrogen bases
The base thymine is replaced by a structurally similar base called uracil. Uracil pairs with adenine in RNA instead of thymine, which pairs with adenine in DNA.
4 NITROGEN BASIS OF DNA:ADENINE GUANINECYTOSINETHYMINEIN RNA, Thymine changes to Uracil.