Which of the bonding examples below is NOT possible?

A. a DNA adenine to a DNA thymine
B. a DNA adenine to an RNA thymine
C. a DNA guanine to an RNA cytosine
D. a DNA adenine to an RNA uracil
E. a DNA guanine to a DNA cytosine

B is not possible. RNA contains only adenine, cytosine, guanine and Uracil instead of Thymine. The rest are correct because Adenine pairs with either uracil (RNA) or thymine (DNA) and cytosine pairs with Guanine

Answered by waniibunny | 2024-06-10

The correct answer is B, as a DNA adenine cannot bond with an RNA thymine since RNA contains uracil instead of thymine. The other options represent valid pairings based on base pairing rules. This reflects the fundamental differences between DNA and RNA structures.
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Answered by waniibunny | 2024-10-23