DNA Sequencing, Mutation and Repair
A nonsense mutation may result into

a premature termination of the synthesis of a polypeptide
an abnormal elongation of a polypeptide
modification of mRNA
a large deletion within the reading frame of a gene

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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 are lower in molecular size
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

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