In their second DNA paper published in May of that year, the GC base pair is shown with only two hydrogen bonds (see top figure). So who spotted the third bond? When? And why was it initially ...

The universal genetic code relies on two hydrogen-bonded Watson–Crick base pairs that can form 64 triplet codons. This places a limit on the number of amino acids that can be encoded ...

These include wobble base pairs, such as G-U and I-A (inosine-adenine), which have a slightly different geometry and hydrogen bonding pattern. Non-Watson-Crick base pairs can play important roles in ...

DNA, our genetic material, normally has the structure of a twisted rope ladder. Experts call this structure a double helix. Among other things, it is stabilized by stacking forces between base pairs.

Rather than hydrogen bonding to keep the two strands of DNA ... two-ringed structures; normal base pairs involve one two-ring base paired with a single-ringed base.) As is often the case, this ...

They are divided into two pairs, which bond together from opposite strands of a DNA molecule to form the rungs of its characteristic double-helix shape. The unnatural but functional new base pair ...