At the end of replication,the contribution of nucleotides from mother $DNA$ is . . . . . . percent.

On which organism did Taylor perform experiments to prove the semi-conservative mode of chromosome replication?

Identify the given model.

Given below are the two statements.
Statement $I$: In prokaryotes,there is only one replicon,however,in eukaryotes,there are several replicons in tandem.
Statement $II$: The two separated strands in a replicon of $DNA$ are prevented from rejoining by helicase enzyme.
In the light of the above statements,choose the correct answer from the options given below.

If $E. coli$ is grown in a $^{15}N$ medium for $80$ minutes,starting from a $^{14}N$ medium,what will be the ratio of light to hybrid $DNA$ molecules obtained?

During the polymerization of deoxyribonucleoside triphosphates in bacteria,which of the following enzymes is mainly required?