DNA Sequencing, Mutation and Repair
A nonsense mutation may result into

a premature termination of the synthesis of a polypeptide
a large deletion within the reading frame of a gene
modification of mRNA
an abnormal elongation of a polypeptide

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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 molecule which stabilizes DNA thus prevents mutations from occurring
a chemical or physical agent that induces mutations

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