Complementary $DNA$ $(cDNA)$ is complementary to

During $DNA$ replication,which of the following does not act as a substrate?

$DNA$ gyrase,the enzyme that participates in the process of $DNA$ replication,is a type of

If a hybrid $DNA$ $(^{14}N-^{15}N)$ is allowed to undergo replication twice in a medium containing nucleotides with $^{15}N$ base,then what proportion of light,heavy,and hybrid $DNA$ will be obtained respectively?

Which bonds does helicase break in $DNA$?

On which plant did Taylor and his colleagues perform experiments using radioactive thymidine to prove the semi-conservative mode of $DNA$ replication?