A) Adenine and thymine; guanine and cytosine
B) Adenine and thymine; guanine and uracil
C) Adenine and guanine, thymine and cytosine
D) Uracil and adenine; cytosine and guanine
Correct Answer: A
Solution :
Deoxyribbnucleic acid (DNA) has the purine bases adenine and guanine and pyrimidine bases thymine and uracil. According to base pairing rule adenine paired with thymine (A = T) and cytosine paired with guanine\[(C\equiv G)\].
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