Nucleic Acids
The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately

25 kJ/mol
20 kJ/mol
10 kJ/mol
30 kJ/mol

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Nucleic Acids
Thymidine

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

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