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Nucleic Acids

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

adenine
thymine
cytosine
guanine

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Nucleic Acids
Nucleic acids can be analyzed experimentally by their

absorption of uv light
absorption of visible light
molecular weight
none of these

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Nucleic Acids
Which of the following is a purine?

Adenine
Thymine
Uracil
Cytosine

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Nucleic Acids
Nucleotide bases and aromatic amino acids absorb light respectively at

270 and 280 nm
280 and 260 nm
260 and 280 nm
260 and 270 nm

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Nucleic Acids
Nucleoside is a pyrimidine or purine base

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

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

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

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