Nucleic Acids
Nucleoside is a pyrimidine or purine base

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

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Nucleic Acids
Thymidine

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

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