Science / Genetics / Pyrimidine: A nitrogen-containing, single-ring, basic compound that occurs in nucleic acids. The pyrimidines in dna are cytosine and thymine: in rna, cytosine and uracil.
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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
Science / Biology / Uracil: The pyrimidine that replaces thymine in RNA molecules and nucleotides. MORE