CONCRETE TECHNOLOGY AND DESIGN OF CONCRETE STRUCTURES QUIZ

A nucleotide consists of

a sugar, a base and three phosphates

a sugar, a base and a phosphate

a sugar and a phosphate

paired bases

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

RNA

mRNA

DNA

rDNA

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

guanine

cytosine

thymine

adenine

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Nucleic acids can be analyzed experimentally by their

absorption of visible light

none of these

molecular weight

absorption of uv light

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Which of the following is a purine?

Cytosine

Adenine

Thymine

Uracil

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The most stabilizing force for nucleic acids is

electrostatic bond

hydrogen bonds

Van der Waals

conformational entropy

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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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The glycosidic bonds in DNA and RNA

connect the sugar to the base

can be hydrolyzed by OH- ion

stabilize Watson-Crick H-bonds

are free to rotate over about 180°

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Nucleoside is a pyrimidine or purine base

ionically bonded to a sugar

hydrogen bonded to a sugar

covalently bonded to a sugar

None of these

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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

20 kJ/mol

10 kJ/mol

25 kJ/mol

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