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Nucleic Acids

Nucleic Acids
A purine with an amine (NH2) group on the 6th carbon is

adenine
guanine
thymine
cytosine

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

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

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Nucleic Acids
Nucleoside is a pyrimidine or purine base

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

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Nucleic Acids
Which of the following is a purine?

Cytosine
Thymine
Uracil
Adenine

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Nucleic Acids
In gel electrophoresis, what fragments will move most quickly through a gel?

None of these
Large genome
Small fragments
Large fragments

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

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