There are special proteins that help to open up $DNA$ double helix in front of the replication fork. These proteins are:

Choose the correct option for $Reverse \text{ } Transcriptase$.

In which type of $DNA$ replication,out of the two newly formed molecules,one is purely new and the other is entirely old?

Distinguish between: Leading strand and Lagging strand.

Identify the given model.

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 the other strand it is discontinuous.
In the light of the above statements,choose the correct answer from the options given below: