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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 usually double stranded and most cellular RNA is single stranded. 1)In DNA the pentose sugar is deoxyribose.Whereas in RNA the pentose sugar is ribose.2)In DNA the common organic bases are adenine,guanine,cytosine and thymine.Whereas in RNA the common organic bases are adenine,guanine,cytosine and uracil.NA is usually double stranded and most cellular RNA is single stranded. 1)In DNA the pentose sugar is deoxyribose.Whereas in RNA the pentose sugar is ribose.