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Nucleic Acids

Nucleic Acids
Which of the following is found on RNA but not DNA?

Deoxyribose
Adenine
Uracil
Phosphate

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Nucleic Acids
Nucleoside is a pyrimidine or purine base

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

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Nucleic Acids
The glycosidic bonds in DNA and RNA

can be hydrolyzed by OH- ion
stabilize Watson-Crick H-bonds
connect the sugar to the base
are free to rotate over about 180°

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

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

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Nucleic Acids
Because DNA is a highly charged polyanion, its stability to heat denaturation

decreases with increasing salt
does not depend on hydrophobic interactions
is independent of G - C content
increases with increasing salt

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Nucleic Acids
A five carbon sugar lacking a hydrogen at the number 2 carbon is found in

rDNA
RNA
mRNA
DNA

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