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

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

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

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