NUCLEIC ACIDS QUIZ

The glycosidic bonds in DNA and RNA

can be hydrolyzed by OH- ion

stabilize Watson-Crick H-bonds

are free to rotate over about 180°

connect the sugar to the base

TRUE ANSWER : ?
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Thymidine

is replaced by uracil in RNA

can participate in hydrophobic interactions due to its methyl group

normally forms two hydrogen bonds with adenosine

All of these

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Which of the following is a purine?

Cytosine

Uracil

Thymine

Adenine

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

30 kJ/mol

10 kJ/mol

20 kJ/mol

25 kJ/mol

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

rDNA

RNA

DNA

mRNA

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The sugar in RNA is , the sugar in DNA is

ribose, deoxyribose

ribose, phosphate

ribose, uracil

deoxyribose, ribose

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Nucleotide bases and aromatic amino acids absorb light respectively at

270 and 280 nm

280 and 260 nm

260 and 280 nm

260 and 270 nm

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

increases with increasing salt

is independent of G - C content

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

guanine

adenine

cytosine

thymine

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A nucleotide consists of

paired bases

a sugar, a base and three phosphates

a sugar and a phosphate

a sugar, a base and a phosphate

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