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 $15\,N$ ?
$40\,cells$
$60\,cells$
$80\,cells$
$20\,cells$
Smallest structure having the power of replicating itself is
Which one of the following correctly represents the manner of replication of $DNA$ ?
If the base sequence in one polynucleotide series of $DNA$ is $G-C-A-T-G$, what shall be the sequence in the replicated complementary strand
$DNA$ multiplication is called
The experimental proof for. semiconservative replication of $DNA$ was first shown in a