Two hydrogen bonds are formed only between Adenine and Thymine because that's how their chemical structures allow them to bind. On the other hand, Cytosine and Guanine form three hydrogen bonds. This difference in the bonds is what gives the DNA its structure.
4H— Arma biotecnologíca altamente efectiva para la protección del medio ambiente 1V— Ámbito donde la biotecnología Y las técnicas de bioingeniería Han encontrado un eco de mayor resonancia. 2V—-