how are dna and rna different
Bases and sugar[edit] DNA is a long polymer with deoxyriboses and phosphate backbone. Having four different nitrogenous bases: adenine, guanine, cytosine and thymine. RNA is a polymer with a ribose and phosphate backbone. Four different nitrogenous bases: adenine, guanine, cytosine, and uracil. Structure of ribose in RNA Structure of deoxyribose in DNA.