NUCLEIC ACIDS QUIZ

The most stabilizing force for nucleic acids is

Van der Waals

conformational entropy

electrostatic bond

hydrogen bonds

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Which pyrimidine base contains an amino group at carbon 4?

Thymine

Cytosine

Adenine

Uracil

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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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Thymidine

is replaced by uracil in RNA

All of these

normally forms two hydrogen bonds with adenosine

can participate in hydrophobic interactions due to its methyl group

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A nucleotide consists of

a sugar, a base and three phosphates

a sugar and a phosphate

a sugar, a base and a phosphate

paired bases

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

Phosphate

Deoxyribose

Adenine

Uracil

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Which of the following is a purine?

Thymine

Uracil

Adenine

Cytosine

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Nucleoside is a pyrimidine or purine base

None of these

hydrogen bonded to a sugar

covalently bonded to a sugar

ionically bonded to a sugar

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

rDNA

DNA

mRNA

RNA

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The glycosidic bonds in DNA and RNA

stabilize Watson-Crick H-bonds

connect the sugar to the base

are free to rotate over about 180°

can be hydrolyzed by OH- ion

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