Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
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
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....
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...
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....
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....
RNA silencing: See: RNA inactivation; and RNA interference....
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...
RNA virus, negative-strand
RNA virus, negative-strand: See: Negative-strand RNA virus....
RNA virus, positive-strand
RNA virus, positive-strand: See: Positive-strand RNA virus....
A class of RNA that is the template upon which polypeptides are put together. Abbreviated mRNA....
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...
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....
RNAi: Abbreviation for RNA interference. See RNA interference....
Roach-2: Or roaches. Street term for Rohypnol....
Roapies: Street term for Rohypnol....