DNA Sequencing, Mutation and Repair
A nonsense mutation introduced into the DNA sequence of a gene may

cause premature termination of the mRNA
have no effect on the transcript or protein made
shorten the length of the protein encoded by the gene
cause a shift in reading frame

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

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