During $DNA$ replication,why is it that the entire molecule does not open in one go? Explain the replication fork. What are the two functions that the monomers $(dNTPs)$ play?

(N/A) $1$. Energy Requirement: The $DNA$ molecule is very long and stable. Separating the entire length of the $DNA$ helix at once would require a massive amount of energy,which is biologically unfeasible.
$2$. Replication Fork: To overcome this,replication occurs within a small opening of the $DNA$ helix,known as the replication fork. This localized opening allows the replication machinery to function efficiently.
$3$. Functions of $dNTPs$: The monomers,known as deoxyribonucleoside triphosphates $(dNTPs)$,serve two primary roles:
$(a)$ They act as substrates for the polymerization of the new $DNA$ strand.
$(b)$ They provide the necessary energy for the polymerization reaction through the hydrolysis of their high-energy phosphate bonds.