Pyrimidine

Science / Biology / Pyrimidine: One of the groups of nitrogenous bases that are part of a nucleotide. Pyrimidines are single ringed, and consist of the bases thymine (in DNA), uracil (replacing thymine in RNA), and cytosine.

Barr Body

Science / Biology / Barr Body: Inactivated X-chromosome in mammalian females. Although inactivated, the Barr body is replicated prior to cell division and thus is passed on to all descendant cells of the embryonic cell that had one MORE

Uracil

Science / Biology / Uracil: The pyrimidine that replaces thymine in RNA molecules and nucleotides. MORE

Thymine

Science / Biology / Thymine: One of the pyrimidine bases in DNA, thymine is replaced by uracil in RNA. MORE

Cytosine

Science / Biology / Cytosine: One of the pyrimidine nitrogenous bases occurring in both DNA and RNA. MORE

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