Nucleic Acids
Nucleoside is a pyrimidine or purine base

hydrogen bonded to a sugar
ionically bonded to a sugar
covalently bonded to a sugar
None of these

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Nucleic Acids
Thymidine

is replaced by uracil in RNA
All of these
can participate in hydrophobic interactions due to its methyl group
normally forms two hydrogen bonds with adenosine

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