70. Several nucleotide bases undergo spontaneous loss of their exocyclic amino groups (deamination). Deamination of the nucleotide bases cytosine and 5-methylcytosine yields nucleotide bases:
(A) hypoxanthine and xantitine, respectively.
(B) uracil and thymine, respectively.
(C) uracil only.
(D) uracil and hypoxanthine, respectively.
(E) thymine and uracil, respectively.
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