NUCLEIC ACIDS QUIZ

Nucleotide bases and aromatic amino acids absorb light respectively at

260 and 270 nm

260 and 280 nm

280 and 260 nm

270 and 280 nm

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

is independent of G - C content

does not depend on hydrophobic interactions

increases with increasing salt

decreases with increasing salt

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

DNA

mRNA

rDNA

RNA

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Which pyrimidine base contains an amino group at carbon 4?

Cytosine

Thymine

Adenine

Uracil

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

thymine

guanine

cytosine

adenine

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Nucleoside is a pyrimidine or purine base

hydrogen bonded to a sugar

ionically bonded to a sugar

None of these

covalently bonded to a sugar

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Which of the following is a purine?

Adenine

Cytosine

Thymine

Uracil

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Nucleic acids can be analyzed experimentally by their

molecular weight

none of these

absorption of uv light

absorption of visible light

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Thymidine

normally forms two hydrogen bonds with adenosine

is replaced by uracil in RNA

can participate in hydrophobic interactions due to its methyl group

All of these

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A nucleotide consists of

paired bases

a sugar and a phosphate

a sugar, a base and three phosphates

a sugar, a base and a phosphate

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