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Nucleic Acids

Nucleic Acids
Which pyrimidine base contains an amino group at carbon 4?

Uracil
Thymine
Cytosine
Adenine

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Nucleic Acids
Nucleoside is a pyrimidine or purine base

None of these
ionically bonded to a sugar
hydrogen bonded to a sugar
covalently bonded to a sugar

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Nucleic Acids
The glycosidic bonds in DNA and RNA

stabilize Watson-Crick H-bonds
connect the sugar to the base
can be hydrolyzed by OH- ion
are free to rotate over about 180°

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Nucleic Acids
Which of the following is a purine?

Uracil
Thymine
Cytosine
Adenine

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Nucleic Acids
Nucleotide bases and aromatic amino acids absorb light respectively at

260 and 270 nm
260 and 280 nm
270 and 280 nm
280 and 260 nm

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

Uracil
Deoxyribose
Adenine
Phosphate

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