Practice problem
Hydrogen Bonds — Overview & Examples
By Deena Hauze
Nucleotides are important in gathering and transferring chemical energy. DNA is made of four different nucleobases, called: guanine, cytosine, adenine, and thymine. You know that famous double helix shape of DNA? That happens because these nucleobases form two chains, which then hydrogen bond together (left image).
Image Sources:
Right: By Isilanes (Own work) [Public domain], via Wikimedia Commons
Left: By Magladem96 CC BY-SA 3.0 or GFDL, via Wikimedia Commons
Guanine and cytosine are partners - they always hydrogen bond with each other. From the image above (right), figure out how many hydrogen bonds guanine and cytosine form with each other.