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well i am not sure what are you asking but if you think the units that form DNA and RNA then the answer would be NUCLEOTIDES ...there are 4 types of nucleotide ... ADENINE THYMINE GUANINE CYTOSINE in case of DNA and in case of RNA THYMINE is substituted with URACIL. Arizona D Â· 7 years ago.
DNA is a doubled stranded structure, while RNA is a single stranded structure. RNA contains the sugar ribose, while DNA contains the sugar deoxyribose. RNA can have 4 nucleoti â¦ des: cytosine, guanine, uracil, and adenine. DNA can have all these nucleotides except for uracil, which is replaced by thymine.ere are some major â¦ differences between RNA and DNA: With the exception of a few viruses, RNA is a single-stranded molecule while DNA is double-stranded. The two DNA chains are connected by hydrogen bonds between nitrogenous bases. DNA can is replicated during cell division; RNA is not.