Which of the following combination is false?

A-T

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A-G

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C-G

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A-U

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Solution

The correct option is B A-G
As per Watson and Crick standard base pairing rules, adenine forms double hydrogen bond with thymine and guanine forms a triple hydrogen bond with cytosine. Hence, the content of adenine is equal to the content of thymine and content of guanine is equal to the content of cytosine. Uracil is the pyrimidine used in RNA in place of thymine. Hence, in the case of RNA, content of adenine is equal to the content of uracil. The content of adenine is not equal to the content of guanine.
So, the correct answer is option B.

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