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

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

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

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

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