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  • DNA JAMA
    (Deoxyribonucleic acid)
    1. The molecular chain found in genes within the nucleus of each cell that carries the genetic information that enables cells to reproduce.

    2. The principal constituent of chromosomes, the structures that transmit hereditary characteristics. The amount of DNA is constant for all typical cells of any given species of plant or animal (including humans), regardless of the size or function of that cell. Each DNA molecule is a long, two-stranded chain made up of subunits, called nucleotides, that contain a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases: adenine (A), guanine (G), thymine (T), and cytosine (C). In 1953 J. D. Watson and F. H. Crick proposed that the strands, connected by hydrogen bonds between the bases, were coiled in a double helix. Adenine bonds only with thymine (A-T or T-A) and guanine only with cytosine (G-C or C-G). The complementarity of this bonding ensures that DNA can be replicated (ie, that identical copies can be made to transmit genetic information to the next generation).
    3. Deoxyribonucleic Acid (DNA): SFAF
      a molecule found in the nucleus of cells as a twisted double-stranded chain that encodes genetic information. The particular sequence of 4 chemical building blocks (nucleotides) -- adenine, cytosine, guanine and thymine -- that make up a DNA chain determines the unique genetic code of an individual. See also ribonucleic acid.
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