A) adenine and thymine, guanine and cytosine
B) uracil and adenine, cytosine and guanine
C) adenine and guanine, thymine and cytosine
D) adenine and thymine, guanine and uracil
Correct Answer: A
Solution :
DNA has a double helical structure. These helix contains polynucleotide chains and these chains are held together by hydrogen bonds. In this polynucleotide chain of DNA, adenine has thymine opposite to it and guanine has cytosine opposite to it.
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