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Uracil

Uracil is a nitrogenous base found in RNA, replacing thymine which is found in DNA. It pairs with adenine during the formation of RNA strands.

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Uracil is only found in RNA and not in DNA.
It forms two hydrogen bonds with adenine during RNA synthesis.
Uracil is a pyrimidine, similar to cytosine and thymine.
The presence of uracil instead of thymine helps distinguish RNA from DNA in cells.
Uracil can be converted into other molecules such as cytosine through a process called deamination.