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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.
Nucleotides or nucleoside monophosphates are monomers of DNA and RNA. However, there are 2 differences in the monomers which form DNA and RNA respectively. The monomers of DNA have 2' H (hydrogen) and base is any of the following: adenine, guanine, cytosine or thymine. While in case of RNA, monomers have 2'OH and any of the following bases: adenine, guanine, cytosine or uracil.