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Rule for pairing of nitrogen-containing bases in DNA

Write down rule for pairing of nitrogen-containing bases in DNA molecule and in RNA?

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Rule for pairing of nitrogen-containing bases of polynucleotide chains which form DNA molecule is pyrimidine base binds to the purine base; under the situation that thymine (T) binds to the adenine (A) and to the cytosine (C) binds to the guanine (G). In the RNA there is no binding among nitrogen-containing bases. It is because RNA is formed of only single polynucleotide chain; another way, DNA is formed of two chains.

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