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In a regular watson-crick double helix base pairing DNA, guanine always pairs opposite cytosine. However this rule holds good only for double helical DNA, as, it is seen in tRNA that guanine (in the anticodon) pairs with cytosine as well as uracil of the corresponding codon in mRNA.

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βˆ™ 14y ago
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βˆ™ 6mo ago

Cytosine is always paired opposite to guanine in DNA and RNA molecules.

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Q: What base is always opposite guanine?
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