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Pyrimidines
cytosine, thymine, and uracil; have a single six-membered ring
Purines
adenine and guanine; have a six-membered ring fused to a five-membered ring
DNA Sugar
deoxyribose
RNA Sugar
ribose
Nucleotide Linkage
phosphodiester linkage
DNA Molecules
antiparallel double stranded helix
RNA Molecules
single stranded
Nucleotides =
nitrogenous base + sugar + phosphate group