Prokaryotes were once described based on structures that were present in eukaryotes,but absent in prokaryotes.

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Prokaryotes were initially described based on the absence of membrane-bound organelles, including nuclei, mitochondria, chloroplasts, and endoplasmic reticulum, which are present in eukaryotic cells. However, it is now known that prokaryotes have their unique structures, such as cell walls, capsules, and flagella, which are absent in eukaryotic cells.

Prokaryotes Were Once Described Based on Structures That Were Present