NUCLEIC ACIDS QUIZ

Which pyrimidine base contains an amino group at carbon 4?

Uracil

Cytosine

Thymine

Adenine

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

Adenine

Deoxyribose

Uracil

Phosphate

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A nucleotide consists of

a sugar, a base and a phosphate

a sugar and a phosphate

paired bases

a sugar, a base and three phosphates

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In gel electrophoresis, what fragments will move most quickly through a gel?

Small fragments

None of these

Large genome

Large fragments

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Thymidine

All of these

normally forms two hydrogen bonds with adenosine

can participate in hydrophobic interactions due to its methyl group

is replaced by uracil in RNA

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

thymine

guanine

cytosine

adenine

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The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately

25 kJ/mol

10 kJ/mol

30 kJ/mol

20 kJ/mol

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Which of the following is a purine?

Thymine

Cytosine

Adenine

Uracil

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The most stabilizing force for nucleic acids is

Van der Waals

hydrogen bonds

electrostatic bond

conformational entropy

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