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Nucleic Acids

Nucleic Acids
Which of the following is a purine?

Adenine
Uracil
Thymine
Cytosine

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

thymine
adenine
guanine
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
increases with increasing salt
does not depend on hydrophobic interactions
decreases with increasing salt

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Nucleic Acids
The glycosidic bonds in DNA and RNA

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

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

rDNA
DNA
RNA
mRNA

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