Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
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RNA
RNA: Short for ribonucleic acid, a nucleic acid molecule similar to DNA but containing ribose rather than deoxyribose. RNA is formed upon a DNA template. There are several classes of RNA
molecules....
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RNA editing
RNA editing: The process in which messenger RNA (mRNA) is chemically modified ("edited") after it is synthesized (made) but before it is translated into protein....
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RNA inactivation
RNA inactivation: A technique for inactivating genes in a cell through the introduction of double-stranded RNA into the cell.
RNA inactivation is based on the phenomenon that animal cells destroy RNA when they meet it in the form of a double strand. If a segment of double-stranded RNA has the same...
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RNA interference
RNA interference: Abbreviated RNAi. The introduction of double-stranded RNA into a cell to inhibit the expression of a gene. Also known as RNA silencing, inhibitory RNA, and RNA inactivation. See also: RNA inactivation....
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RNA polymerase
RNA polymerase: A polymerase is an enzyme that
catalyzes the joining of many smaller molecules (called monomers) to form a big molecule
(a macromolecule). RNA polymerase is a unique enzyme that makes (synthesizes) the
macromolecule RNA using DNA as the template....
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RNA silencing
RNA silencing: See: RNA inactivation; and RNA interference....
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RNA virus
RNA virus: A virus in which the genetic material is RNA. The RNA may be either double- or single-stranded.
There are 6 classes of viruses. The DNA viruses constitute classes I and II. The RNA viruses make up the remaining classes. Class III viruses have a double-stranded RNA genome. Class IV viruses...
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RNA virus, negative-strand
RNA virus, negative-strand: See: Negative-strand RNA virus....
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RNA virus, positive-strand
RNA virus, positive-strand: See: Positive-strand RNA virus....
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RNA, messenger
RNA, messenger:
A class of RNA that is the template upon which polypeptides are put together. Abbreviated mRNA....
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RNA, ribosomal
RNA, ribosomal: A molecular component of a ribosome, the cell's essential protein factory. Ribosomal RNA (rRNA) fabricates polypeptides (assemblies of amino acids that make up proteins).
A tiny particulate structure located in the cytoplasm of the cell (outside the nucleus), the ribosome is compose...
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RNA, transfer
RNA, transfer:
In cooperation with the ribosomes, transfer RNA brings (transfers) activated amino acids into position along the messenger RNA template. The abbreviation for transfer RNA is tRNA....
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RNAi
RNAi: Abbreviation for RNA interference. See RNA interference....
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Roach-2
Roach-2: Or roaches. Street term for Rohypnol....
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Roapies
Roapies: Street term for Rohypnol....
