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An achievement celebrated in international headlines, Dr. J. Craig Venter of Celera Genomics published the human genome map, pictured here, in 2000. A genome is the entirety of an organism's DNA, and can be written as a long sequence of nucleotides (A, T, C, and G).

somes. Thus, the physical organization of the genome varies from interphase to division phase. Finally, viruses (which are noncellular, parasitic "life forms") have genomes of double-stranded DNA, single-stranded DNA, double-stranded RNA, or single-stranded RNA.

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