1.

In DNA, the complementory bases areA. adenine and thymine, guanine and cytosineB. uracil and adenine, cytosine and guanineC. adenine and guanine, thymine and cytosineD. adenine and thymine, guanine and uracil

Answer» Correct Answer - A
DNA has a double helical structure. These helix contains polynucleotides chain and these chains are held together by hydrogen bonds . In these polynucleotide chain of DNA , adenine has thymine opposite to it and guanine has cytosine opposite to it.


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