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add complementary nucteotides (found floating in the nucleus) to the original strands
each of the new DNA molecules has kept one of the two original DNA strands
change in the nucleotide sequence of a DNA molecule (can disrupt an important cell function)
griffith and avery
1900's. used BACTERIA viruent into a non-effected bacteria, in which the noninfected bacteria was then filled will virulent DNA and made you sick
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