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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DNA Sequencing, Mutation and Repair
The whole-genome shotgun sequencing approach depends primarily on

rapidly sequencing thousands of small randomly cloned fragments
methodical sequencing a few large cloned fragments of DNA
All of these
sequencing the bacterial chromosome while it is still intact

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