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| | fUSION Anomaly. DNA (Site not responding. Last check: 2007-10-27) |
 | | It is the principal constituent of GENES (linear segments of DNA) and 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, regardless of the size or function of that cell. |
 | | Each DNA molecule is a long, two-stranded chain made up of subunits, called nucleotides, containing a sugar (deoxyribose), a phosphate group, and one of four nitrogenous bases: adenine (A), guanine (G), thymine (T), and cytosine (C). |
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