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Which of these interactions is the weakest?

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Which of these interactions is the weakest?

(a) rC-dG

(b) rG-dC

(c) rA-dT

(d) rU-dA

I got this question during an internship interview.

This question is from Transcription in Prokaryotes : Termination topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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The correct answer is (d) rU-dA

For explanation I would say: The interaction between A and T or U base is through 2 hydrogen bonds only. So this is weaker than G-C which mediates by 3 hydrogen bonds. Further RNA DNA interactions are weaker making rU-dA the weakest of interaction which is used in termination of transcription.

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