NUCLEIC ACIDS QUIZ

Which of the following is a purine?

Cytosine

Uracil

Adenine

Thymine

TRUE ANSWER : ?
YOUR ANSWER : ?

The sugar in RNA is , the sugar in DNA is

ribose, deoxyribose

ribose, phosphate

deoxyribose, ribose

ribose, uracil

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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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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 can be analyzed experimentally by their

molecular weight

absorption of visible light

absorption of uv light

none of these

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Nucleotide bases and aromatic amino acids absorb light respectively at

260 and 280 nm

270 and 280 nm

280 and 260 nm

260 and 270 nm

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Thymidine

normally forms two hydrogen bonds with adenosine

All of these

is replaced by uracil in RNA

can participate in hydrophobic interactions due to its methyl group

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The most stabilizing force for nucleic acids is

conformational entropy

hydrogen bonds

Van der Waals

electrostatic bond

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

is independent of G - C content

increases with increasing salt

decreases with increasing salt

does not depend on hydrophobic interactions

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YOUR ANSWER : ?

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

thymine

cytosine

guanine

adenine

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