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Nucleic Acids

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

Deoxyribose
Uracil
Phosphate
Adenine

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

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

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Nucleic Acids
A nucleotide consists of

a sugar, a base and a phosphate
a sugar, a base and three phosphates
a sugar and a phosphate
paired bases

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

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

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Nucleic Acids
The glycosidic bonds in DNA and RNA

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

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Nucleic Acids
Which of the following is a purine?

Thymine
Uracil
Cytosine
Adenine

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