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
Due to which of the following DNA repair mechanisms, one is able to distinguish newly synthesized DNA strands from older one?

New strands do not contain cytosine bases
Old strands are methylated while new strands are not
New strands are lower in molecular size
New strands are methylated while old strands are not

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DNA Sequencing, Mutation and Repair
The DNA sequences of rRNA genes can be used to

predict the pulsed field gel pattern of a microorganism
obtain a tentative identification of a new microorganism
assess relatedness of eukaryotes but not prokaryotes
predict whether a bacteria will be gram-positive or gram-negative

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