Remember what is the principle of complementarity. What nucleotides in a DNA molecule are complementary to each other? With what bonds are nucleotides connected into a double helix of a DNA molecule?
The principle of complementarity is a biological law according to which purines (molecules whose chemical framework includes 3 carbon rings, in DNA and RNA are adenine and cytosine) interact only with pyrimidines (they have 2 carbon rings, in DNA it is thymine and guanine, and in RNA – uracil). The principle of complementarity is due to the chemical structure of nitrogenous bases:
Adenine (A) -thymine (T)
Cytosine (C) – guanine (G)
Nucleotides bind into a double helix of a DNA molecule using hydrogen bonds.
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