Why do bacteria usually contain an even number of replisomes? Choose one: A. Bacteria need only one replisome; the other serves as a backup copy. B. Because replication is bidirectional, there are two replication forks emanating from the origin of replication. C. There are two copies of the gene that codes for DNA polymerase, an important enzymatic protein component of replisomes. D. DNA is double-stranded and each single strand requires its own replisome.

Replisomes are the complex molecular machine composed of proteins in the form of enzymes which can carry out the Replication of DNA in both prokaryotes and eukaryotes. The enzymes include the Helicase, DNA polymerase and a clamp loader.

The DNA replication in bacteria is bidirectional that is replication takes place in both the directions at the same time by the formation of two replication forks at the two terminals of the replication fork. The two replication forks thus require two replisomes to proceed with the reaction.

Thus, Option-B is the correct answer.

adeoladokun31 adeoladokun31 · Answer 2 · 2020-02-06T09:52:51+01:00

Answer: Option B.

Because replication is bidirectional, there are two replication forks emanating from the origin of replication.

Explanation:

Replisomes are complexes that involve in DNA replication. Replisomes consist of many proteins like ligase, helicase,topoisomerase,DNA polymerase III, e.t.c. The replisomes first unwind double stranded DNA to single strands DNA.

In prokaryotes,the nucleoid divides and requires two replisomes for bidirectional replication. Bacteria normally have even number of chromosome because the replication is bidirectional, and there are two forks which emanates from the origin of replication. The replication forks duplicate both the leading and the lagging strands.

The major function of replisomes is to carryout DNA replication.