During $DNA$ replication which of the following does not act as substrates?
$dATP$
$dCTP$
$dUTP$
$dGTP$
Which of the following figures correctly represents the replication fork formed during $DNA$ replication
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 $15\,N$ ?
Escherichia coli fully labelled with $15 \mathrm{~N}$ is allowed to grow in $14 \mathrm{~N}$ medium. The two strands of $DNA$ molecule of the first generation bacteria have
Smallest structure having the power of replicating itself is
Which is not correctly matched