Thymine is used in DNA despite the fact that it is energetically more expensive to synthesize than uracil because
A) spontaneous deamination reactions convert cytosine to uracil at a fairly high rate.
B) uracil is more sensitive to ultraviolet (UV) damage.
C) uracil is more susceptible to depurination.
D) uracil can only bind with ribose, not deoxyribose.
E) thymine is less likely to undergo spontaneous deamination than uracil.
Answer: A
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