DNA Sequencing, Mutation and Repair
The promoter on an expression vector used to overproduce proteins in bacteria is

the natural promoter of the gene being cloned
not a regulated promoter
a bacterial promoter
expressed both in bacteria and mammalian cells

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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
an inhibitor of gene modification
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 methylated while old strands are not
New strands are lower in molecular size

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