Hypermedia Glossary Of Genetic Terms
|Pyrimidine||A nitrogen-containing, single-ring, basic compound (cf. nitrogenous base) that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine. The pyrimidines in RNA are cytosine and uracil.
|Nitrogenous base||A nitrogen-containing molecule having the chemical properties of a base. See purine and pyrimidine.|
|Nucleic acid||A large molecule composed of nucleotide subunits.|
|Deoxyribonucleic acid (DNA)||The molecule that encodes genetic information. DNA is a double-stranded molecule held together by weak bonds between base pairs of nucleotides. The four nucleotides in DNA contain the bases: adenine (A), guanine (G), cytosine (C), and thymine (T). In nature, base pairs form only between A and T and between G and C; thus the base sequence of each single strand can be deduced from that of its partner.|
|Cytosine (C)||Cytosine is a pyrimidne base (nitrogenous base) and constituent of nulceotides and as such one member of the base pair G-C (guanine and cytosine) .
|Thymine (T)||Thymine is a pyrimidine base (nitrogenous base) and constituent of nulceotides and as such one member of the base pair A-T (adenine-thymine) in DNA.
|Ribonucleic acid (RNA)||A chemical found in the nucleus and cytoplasm of cells; it plays an important role in protein synthesis and other chemical activities of the cell. The structure of RNA is similar to that of DNA. There are several classes of RNA molecules, including messenger RNA, transfer RNA, ribosomal RNA, and other small RNAs, each serving a different purpose.|
|Uracil (U)||Uracil is a pyrimidine base (nitrogenous base) and constituent of nucleotides and as such one member of the base pair A-U (adenine-uracil). It is normally found in RNA but not DNA.
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