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Biochemistry

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Purines, Pyrimidines and Nucleic Acid Metabolism

Question
5 out of 14
 

Nucleic acid absorbs light at wavelength of 260 nm due to



A Proteins
B Ribose

C Purines & Pyrimidines
D Deoxyribose

Ans. C Purines and pyrimidines

a. Nucleotides Absorb ultraviolet light: - The conjugated double bonds of the hetro-cyclic bases of purines and pyrimidine ensure that nucleotides, nucleosides, and poly-nucleotides (DNA) absorb ultraviolet light.

b. At PH. 7.0 all the common nucleotides absorb light at a wavelength close to 260nm. The mutagenic effect of UV light result from its absorption by nucleotides in DNA with accompanying chemical change.

Purines, Pyrimidines and Nucleic Acid Metabolism Flashcard List

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