[Campbell Biology P.291] Which statement accurately describes a key characteristic of binary... | Practice Question
Which statement accurately describes a key characteristic of binary fission in bacteria, as explained in the text?
A: Bacterial chromosomes replicate multiple origins of replication simultaneously, followed by mitotic spindle formation.
B: The process involves a complex series of mitotic phases, similar to eukaryotic cell division, to ensure equal distribution of genetic material.
C: A single, circular DNA molecule replicates, and its two origins move toward opposite ends of the elongating cell, followed by the plasma membrane pinching inward to divide the cell.
D: Bacterial chromosomes contain centromeres that attach to microtubules for segregation, similar to eukaryotic chromosomes during anaphase.
E: Binary fission is exclusively a form of sexual reproduction observed only in prokaryotes.
Explanation
The text explains that in bacteria, cell division binary fission begins with the replication of a single, circular DNA molecule at a specific 'origin of replication,' producing two origins. As the cell elongates, these two origins move to opposite ends. Once replication is complete and the cell has doubled in size, the plasma membrane pinches inward to form two daughter cells. Crucially, bacteria lack visible mitotic spindles or microtubules.