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Which protein forms the ring that pinches a dividing bacterium in two?
AThe actin protein
BThe FtsZ protein
CThe tubulin protein
DThe cohesin protein
Answer & Solution
Correct answer: B. The FtsZ protein
1. Once the two copies of the chromosome have moved apart, the cell must split.
2. Repeating units of FtsZ assemble into a ring between the two nucleoids.
3. That ring recruits the proteins that bring in new membrane and wall material.
4. A septum then grows inward until the two daughter cells separate.
5. Actin rings do this job in animal cells, which is a different mechanism.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.5 Prokaryotic Cell Division_
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