Which of the following statements is correct?Only the chromosome is replicated before division.The chromosome and plasmids are replicated before division.No DNA is replicated before division.Only the plasmids are replicated before division.
Question
Which of the following statements is correct?Only the chromosome is replicated before division.The chromosome and plasmids are replicated before division.No DNA is replicated before division.Only the plasmids are replicated before division.
Solution
The correct statement is: "The chromosome and plasmids are replicated before division."
Here's why:
In a cell, before division occurs, both the chromosome (the main DNA molecule) and any plasmids (small, circular pieces of DNA) are replicated. This is to ensure that each daughter cell receives a complete set of genetic information.
The process begins in the S phase of the cell cycle, where the DNA replication occurs. The DNA unwinds and each strand is used as a template for the synthesis of a new, complementary strand. This results in two identical copies of each chromosome and plasmid.
After replication, the cell enters the M phase, where the replicated chromosomes and plasmids are separated and the cell divides, distributing a complete set of genetic information to each of the two new cells.
So, the statement "Only the chromosome is replicated before division" is incorrect because not only the chromosome but also the plasmids are replicated.
The statement "No DNA is
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