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1) Treatment of DNA with methylnitrosourea (MNU) can result in methylation of guanine to produce O6-methylguanine....

1) Treatment of DNA with methylnitrosourea (MNU) can result in methylation of guanine to produce O6-methylguanine. A) This modification results in a GC à AT transition- explain why. B) What is the major enzyme required for this type of repair accomplished? C) What category of DNA repair does this correspond to?

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A) 6- o methyl guanine is a derivative of nucleobase guanine in whichmethyl group is attached to oxygen. It base pairs to thymine rather than cytosine causing GC to AT transition in dna.

B)major enzyme required for this proces is O 6methyl guanine dna methyl transferase.

C) base excition repair is corespondence to it.

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