what are the rungs of the dna ladder made of
The rungs of the ladder are pairs of 4 types of nitrogen bases (thymines, adenines, guanines, cytosines). ---. The pairs are guanine and cytosine (G-C), or adenine and thymine (A-T). The rungs of the dna ladder are made of alternating sugars and phosophate groups. The uprights are called the backbone and is made up of ribose (a pentose sugar) and phosphate. The rungs are the bases that are the actual coding bit of DNA. These are c â¦ arbon and nitrogen-based molecules that attach to the backbone.