When dna begins to replicate, two strands of the dna helix are separated, forming a replication bubble. at each end of the bubble is a replication fork. this activity will you to become familiar with the roles of key structures at the replication fork?

During the process of replication, the double stranded DNA unwinds and parts itself by the action of enzyme called as Helicase. The unwinding or separation of DNA forms a replication bubble and at the edge of the replication bubble is the replication fork.

DNA replication starts at the point called as origin of replication or ORI at the replication fork. DNA polymerase is the enzyme that plays a key role in DNA replication. DNA continues to replicate until the entire new strand is not formed.

the answer to your question is b

a symbiotic relationship with the mitochondria