Why are there two hydrogen bonds between adenine and thymine but three hydrogen bonds between cytosine and guanine?
In respect to this, why does cytosine and guanine have 3 hydrogen bonds?
Guanine and Cytosine Base pair has three hydrogen bonds,because the exocyclic NH2 at C2 on Guanine lies opposite to,and can hydrogen bond with,a carbonyl at C2 on Cytosine.
Similarly, why is there hydrogen bonds between each nitrogen base? Base Pairing in DNA The nitrogen bases form the double-strand of DNA through weak hydrogen bonds. The nitrogen bases, however, have specific shapes and hydrogen bond properties so that guanine and cytosine only bond with each other, while adenine and thymine also bond exclusively.
Keeping this in consideration, how many hydrogen bonds are possible between adenine and guanine?
Two hydrogen bonds
How many hydrogen bonds are found between CG?
The A-T pair forms two hydrogen bonds. The C-G pair forms three. The hydrogen bonding between complementary bases holds the two strands of DNA together. Hydrogen bonds are not chemical bonds.