Word: dna
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Dates: during 1960-1969
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...lactose gene segments of DNA were chemically complementary and combined easily into a double strand...
...since the two types of viral DNA were not oriented in complementary pairs, the viral DNA remained as loose, single strands...
...DNA in these viruses is arranged in two, loosely linked strands, with one molecular strand containing the chemical complement of the other. These long molecules are ordinarily coiled around each other in the head of a virus particle once it leaves the host cell...
...After isolating the viruses from E. coli, the scientists chemically separated each of the strands of DNA in thetwo virus strains...
They then combined a single piece of DNA from one virus with another strand from the other virus type...