DNA Sequencing, Mutation and Repair
Frame shift mutation may occur as a result of

formation of a thymine-dimer
deamination of cytosine to uracil
None of these
conversion of guanine to xanthine

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

an enzyme that repairs mutations
an inhibitor of gene modification
a chemical or physical agent that induces mutations
a molecule which stabilizes DNA thus prevents mutations from occurring

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