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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. RNA 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....
  2. RNA editing 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....
  3. RNA inactivation 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...
  4. RNA interference 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....
  5. RNA polymerase 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....
  6. RNA silencing RNA silencing
    RNA silencing: See: RNA inactivation; and RNA interference....
  7. RNA virus 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...
  8. RNA virus, negative-strand RNA virus, negative-strand
    RNA virus, negative-strand: See: Negative-strand RNA virus....
  9. RNA virus, positive-strand RNA virus, positive-strand
    RNA virus, positive-strand: See: Positive-strand RNA virus....
  10. RNA, messenger RNA, messenger
    RNA, messenger: A class of RNA that is the template upon which polypeptides are put together. Abbreviated mRNA....
  11. RNA, ribosomal 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...
  12. RNA, transfer 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....
  13. RNAi RNAi
    RNAi: Abbreviation for RNA interference. See RNA interference....
  14. Roach-2 Roach-2
    Roach-2: Or roaches. Street term for Rohypnol....
  15. Roapies Roapies
    Roapies: Street term for Rohypnol....