DNA Structure and Replication
In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band

with 14N-containing DNA
above DNA containing 14N
all of these
below DNA containing 14N

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DNA Structure and Replication
In DNA, there are

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
four bases known as adenine, guanine, thymine and cytosine

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