Final answer:
The membrane in a prokaryotic cell controls what enters and leaves the cell, maintaining homeostasis by regulating the passage of materials.
Explanation:
Plasma membrane, cytoplasm, ribosomes, plasmid, pili, bacterial flagellum, and nucleoid (circular DNA) are key components of a prokaryotic cell. Among these, the structure that controls what enters and leaves the cell and maintains homeostasis is the membrane.
Learn more about Prokaryotic cell structure and function here:
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