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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.
RNA is a single strand of nucleotides and DNA is double stranded. RNA is made of bases, phosphates, and ribose and DNA is made of bases, phosphates, and deoxyribose. DNA is used in replication and as the template strand in transcription. RNA is the sequence that is copied.