DNA Structure and Replication
Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

5' → 3' exonuclease
All of these
5' → 3' polymerase
3' → 5' exonuclease

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DNA Structure and Replication
In DNA, there are

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

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