Bio-Chemistry (M.Phil./Ph.D.) 2016 Panjab University Entrance Exam With Answers

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3.

DNA repair mechanisms can distinguish old strand of DNA from newly synthesized strands because

A: New strands are glycosylated while old are not
B: Old strands are methylated while new strands are not
C: New stands are methylated while old strands are not
D: New strands do not contain cytosine bases

The answer is: B

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