DNA Structure and Replication
During conventional transformation experiments E. coli cells and plasmid DNA interacts in an environment of

high temperature and Ca++
low temperature and Mg++
low temperature and Ca++
high temperature and Mg++

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DNA Structure and Replication
In DNA, there are

only two bases known as adenine and cytosine
four bases known as adenine, guanine, thymine and cytosine
five bases known as adenine, guanine, thymine, tryptophan and cytosine
three bases known as adenine, guanine and cytosine

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