NUCLEIC ACIDS QUIZ

A nucleotide consists of

a sugar, a base and three phosphates

paired bases

a sugar, a base and a phosphate

a sugar and a phosphate

TRUE ANSWER : ?
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A purine with an amine (NH2) group on the 6th carbon is

thymine

adenine

guanine

cytosine

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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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YOUR ANSWER : ?

The most stabilizing force for nucleic acids is

electrostatic bond

hydrogen bonds

conformational entropy

Van der Waals

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The sugar in RNA is , the sugar in DNA is

ribose, deoxyribose

deoxyribose, ribose

ribose, uracil

ribose, phosphate

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

mRNA

rDNA

RNA

DNA

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

10 kJ/mol

20 kJ/mol

25 kJ/mol

30 kJ/mol

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Thymidine

can participate in hydrophobic interactions due to its methyl group

is replaced by uracil in RNA

normally forms two hydrogen bonds with adenosine

All of these

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Nucleic acids can be analyzed experimentally by their

absorption of visible light

molecular weight

absorption of uv light

none of these

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Which of the following is a purine?

Thymine

Adenine

Cytosine

Uracil

TRUE ANSWER : ?
YOUR ANSWER : ?

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