DNA Structure and Replication
E.coli DNA polymerases II and III lack

partially 5' → 3' endonuclease activity
5' → 3' endonuclease activity
partially 5' → 3' exonuclease activity
5' → 3' exonuclease activity

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DNA Structure and Replication
In DNA, there are

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

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