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?

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

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

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

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