A) adenine, guanine, cytosine, thymine
B) adenine, guanine, cytosine, uracil
C) adenine, thymine, uracil
D) guanine, uracil
Correct Answer: A
Solution :
In DNA, nitrogen bases are nitrogen containing organic ring compounds and are of two types; purines are two, adenine and guanine, while pyrimidines are cytosine and thymine.
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