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

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

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DNA Structure and Replication
In DNA, there are

three bases known as adenine, guanine and cytosine
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

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