Binary fission is the process by which prokaryotes, such as bacteria, produce new cells. For a unicellular organism, cell division also produces new individuals. This lesson explains how a bacterial chromosome is copied and how the cell divides its contents to create two daughter cells.
Cell reproduction must provide each daughter cell with the genetic information and cytoplasmic contents needed to live. The genomic DNA is replicated and allocated to the daughter cells, while the cytoplasm is divided so each new cell receives cellular machinery.
All flashcards
What must binary fission distribute to each daughter cell?
A copy of the genetic information and enough cytoplasmic contents, including cellular machinery.
How are bacterial chromosome copies positioned during binary fission?
As the cell elongates, the copies move into separate regions toward opposite ends of the cell.
What does the FtsZ ring do during bacterial cell division?
It organizes the division site and helps recruit proteins and coordinate construction of the partition.
How are FtsZ and tubulin evolutionarily related?
They are homologous proteins related through a common evolutionary origin.
How does a bacterial septum differ from a eukaryotic cleavage furrow?
A septum is a partition built inward from the cell periphery; a cleavage furrow is an indentation that pinches a eukaryotic cell.
Quiz questions
Why do prokaryotes not use a mitotic spindle to divide their chromosomes?Answer: They lack a true nucleus and do not undergo karyokinesis.
Which role does tubulin have in eukaryotic cells?Answer: It is the protein building block of microtubules, including spindle fibers.
What do FtsZ and tubulin have in common?Answer: Both use GTP during the dynamic assembly and disassembly of structures.
What is the evolutionary relationship between FtsZ and tubulin?Answer: They are homologous proteins with a shared evolutionary origin.
How do animal cells typically divide their cytoplasm?Answer: Microfilaments form a cleavage furrow that pinches the cell.
Based on Biology 2e by Mary Ann Clark, Matthew Douglas, Jung Choi (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.