Generally in medicine, U refers to uracil, G refers to guanine, and T refers to thymine. 1. In the human body, DNA (deoxyribonucleic acid) is mainly used for storing, copying and transmitting genetic information, and RNA (ribonucleic acid) plays an important role mainly in protein synthesis. 2.U uracil, on the other hand, is a unique base in RNA, T thymine is the main base of DNA, and G guanine is a base found in both DNA and RNA. the bases of DNA are A adenine, G guanine, C cytosine, and T thymine. the bases of RNA are A adenine, G guanine, C cytosine, and U uracil. 3. These bases follow the principle of complementary base pairing, helical arrangement into the body’s DNA and RNA, involved in human life activities.