DNA Structure and Replication
DNA gyrase in E. coli

adds positive supercoils to chromosomal DNA
performs the same function as helicase in eukaryotes
is required only at the oriC site
can be inhibited with antibiotics

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DNA Structure and Replication
In DNA, there are

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

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