Uracil

=Uracil=

**Uracil **  (often abbreviated to **U ** , chemical formula C4H4N2O2) is a nitrogenous nucleobase, found only in RNA , where it replaces the DNA  equivalent of thymine . Within RNA, its monomeric constituent is called **uridine monophosphate ** (UMP), and it is added to the growing RNA chain as a precursor, **<span style="font-family: Arial,Helvetica,sans-serif; font-size: 90%;">uridine triphosphate ** <span style="font-family: Arial,Helvetica,sans-serif; font-size: 11.34px;">(UTP).

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 11.34px;">Uracil is a pyrimidine derivative, and it base-pairs with adenine using two hydrogen bonds.