DNA Sequencing, Mutation and Repair
Differentiation of four different bases in automated sequencing systems is that each base has

cytosine at start
distinctive fluorescent tag
unique antibody bound to it
different radioactive tag

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DNA Sequencing, Mutation and Repair
A mutagen is defined as

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

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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
New strands are methylated while old strands are not
Old strands are methylated while new strands are not
New strands are lower in molecular size

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