Final answer:
Cytosine can deaminate to form uracil during a spontaneous mutagenic process.
Step-by-step explanation:
True. Cytosine can undergo spontaneous deamination, which converts it to uracil. This is a form of mutagenesis that can lead to the formation of a mutation in the DNA. However, there is a repair mechanism in place that removes the uracil and replaces it with the correct nucleotide, preventing the mutation from persisting.