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
different density and do not resemble with their parent $DNA.$
different density but resemble with their parent $DNA.$
same density and resemble with their parent $DNA.$
same density but do not resemble with their parent $DNA.$
Given below are two statements :
Statement $I:$
DNA polymerases catalyse polymerisation only in one direction, that is $5^{\prime} \rightarrow 3^{\prime}$
Statement $II:$
During replication of $DNA$, on one strand the replication is continuous while on other strand it is discontinuous.
In the light of the above statements, choose the correct answer from the options given below :
In which type of $DNA$ replication of the two newly formed molecules one is purely a new one and the other one is old
Self replication is occurred in
$DNA$ polymerase helps in
The experimental proof for. semiconservative replication of $DNA$ was first shown in a