DNA Structure and Replication
Automated DNA sequencing uses the chain termination method

but with a polynucleotide primer labeled with a fluorescent dye
either (b) or (c)
with no primer
but with an oligonucleotide primer labeled with a fluorescent dye

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DNA Structure and Replication
In DNA, there are

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
three bases known as adenine, guanine and cytosine

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