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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.
1. RNA is usually single stranded while DNA is usually double stranded... 2. RNA nucleotides contain ribose as their sugar and DNA contains deoxyribose (a type of ribose without one oxygen molecule) 3. RNA uses the base Uracil which binds to Adenine while DNA uses Thymine as a base that binds to Adenine.. RNA contains the nitrgoenous base uracil instead of the nitrgoenous base thymine found in DNA. 3. RNA is usually single stranded unlike DNA which is a double helix.