b (b) The two strands $(polynucleotide chains)$ of Double helix are antiparallel complementary.
The sequence of nitrogenous bases in one determines the sequence of nitrogenous bases in the other.
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Ten E.coli cells with ${ }^{15} N$ - dsDNA are incubated in medium containing ${ }^{14} N$ nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from $15\,N$ ?