Which of these two changes is more difficult for DNA repair enzymes to fix correctly? Explain why. Transcribed Image Text: NH2 н ‘N’ Н +
Which of these two changes is more difficult for DNA repair enzymes to fix correctly? Explain why. Transcribed Image Text: NH2
н
‘N’
Н
+ H20
+ NH3
H.
Sugar
Sugar
Cytosine
Uracil
(a) Deamination of cytosine
NH2
CHз
Н.
N.
CH3
+ H,0
+ NH3
H.
H.
Sugar
Sugar
5-methylcytosine
Thymine
(b) Deamination of 5-methylcytosine
FIGURE 19.8 Spontaneous deamination of cytosine and
5-methylcytos ine. (a) The deamination of cytosine produces uracil.
(b) The deamination of 5-methylcytosine produces thymine.
エ
エ
エ
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