DNA Structure and Replication
What does ligase do during replication of DNA?

Makes copies of mRNA from DNA
Synthesizes the lagging strand
Digests mRNA when it is no longer needed
Joins nicks in DNA strands

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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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