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DNA is a molecule composed of two chains that coil around each other to form a double helix.  DNA carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses. DNA strands are composed of simpler units called nucleotides.  Each nucleotide is composed of one of…

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DNA is a molecule composed of two chains that coil around each other to form a double helix.  DNA carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses. DNA strands are composed of simpler units called nucleotides.  Each nucleotide is composed of one of…