text: A nitrogen base is a base primarily composed of nitrogen.\n\nIn the DNA ladder-like format, there are 4 rungs.\n\nThe rungs are formed from two nitrogen bases that connect in the middle of the rung.\n\nThese are the four nitrogen bases according to what nitrogen bases they connect to. They connect to no other, except in RNA.\n\nADENINE - THYMINE\nGUANINE - CYTOSINE\n\nYou can also remember ATGC, just as initials to remind you.