Why does the deamination of a 5-methylcytosine generally cause a mutation, but the deamination of a cytosine does not have the same effect?
a. because DNA repair systems are much more effective in recognizing G-U mispairing
b. because DNA repair systems are less effective in recognizing G-T mispairing
c. because DNA repair systems are much more effective in recognizing deaminated cytosine
d. because DNA repair systems are less effective in recognizing deaminated 5- methylcytosine
e. All of the above
Ans: e
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