In DNA,a Purine Must Always Pair with a Pyrimidine and Vice

question 66

Multiple Choice

In DNA,a purine must always pair with a pyrimidine and vice versa in order to ensure that

• A)the distance between the two phosphodiester backbones remains constant.
• B)the two strands are antiparallel.
• C)the distance between one base pair and the next remains constant.
• D)each base pair is held together by three hydrogen bonds.

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