Nucleotides and Nucleic Acids In naming and numbering nucleotides,positions on the sugars are given a prime superscript to distinguish them from positions on the amine base ▣ DNA and RNA differ dramatically in size Molecules of DNA have molecular weights up to 75 billion -Molecules of RNA are much smaller,containing as few as 21 nucleotides,and have a molecular weight as low as7,000▪ In naming and numbering nucleotides, positions on the sugars are given a prime superscript to distinguish them from positions on the amine base ▪ DNA and RNA differ dramatically in size ▪ Molecules of DNA have molecular weights up to 75 billion ▪ Molecules of RNA are much smaller, containing as few as 21 nucleotides, and have a molecular weight as low as 7,000 Nucleotides and Nucleic Acids