If you isolate a single nucleotide from a nucleic acid chain and determine that the nitrogenous ring structure is cytosine, you could say with certainty that the nucleotide may have come from:
A) DNA but not RNA.
B) RNA but not DNA.
C) either DNA or RNA.
D) neither DNA nor RNA.
E) double-stranded DNA but not single-stranded DNA.
Correct Answer:
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