What are the base pairs in dna and rna?

Although very similar, the base pairs in DNA and RNA differ by one nitrogenous base. 

In DNA, the four nitrogenous bases are Adenine, Thymine, Guanine, and Cytosine. Adenine always bonds to thymine (in DNA), they are connected by two Hydrogen bonds. Cytosine and Guanine are always bonded together. They are connected by three Hydrogen bonds. 

However, in RNA, there is no thymine and instead, there is Uracil. That is the only nitrogenous base that is different. Cytosine still bonds to guanine, and adenine bonds to uracil. 

I hope that helps!

Every nucleotide in the coding strand has a complementary nucleotide in the other strand, called the template strand. The Watson-Crick pairs are the standard DNA and RNA base pairs. In DNA, adenine bonds to thymine while guanine bonds with cytosine. The same pairs apply to RNA, except that uracil replaces thymine.

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