DNA+Bonding+between+base-pairs

DNA Bondiing between base pairs

In order to link the bases together to for a pair, 2 or 3 hydrogen atoms are used from the bases to link across to the other base.

The GC pair used triple hydrogen bonding. The AT pair uses double hydrogen bonding

Consequently A cannot link with G or C as the number of hydrogen atoms involved is a mismatch. Similarly for T with G or C.

[|Detailed information from Wikipedia]