DNA Sequencing, Mutation and Repair
Frame shift mutation may occur as a result of

conversion of guanine to xanthine
None of these
formation of a thymine-dimer
deamination of cytosine to uracil

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

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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 inhibitor of gene modification
an enzyme that repairs mutations

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