What prevents adenine from pairing with guanine?

3) The structural problem which prevents adenine from pairing with guanine is that the bases are both long.Click to see full answer. Herein, can adenine pair with guanine?In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine. what are the correct base pairing rules for DNA? The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with. the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with. the purine guanine (G) Also to know, why will guanine not bind to adenine? Two purines will not fit between the strands while two pyrimidines will be too far to bond. Therefore a purine has to make a hydrogen bond with another pyrimidine. Hence adenine makes hydrogen bonds with thymine and guanine makes hydrogen bonds with cytosine.Why can’t AC and GT pairs form?The arrangements of atoms in the four kinds of nitrogenous bases is such that two hydrogen bonds are formed automatically when A and T are present on opposite DNA strands, and three are formed when G and C come together this way. A-C or G-T pairs would not be able to form similar sets of hydro- gen bonds.

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