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An early false turn was the idea developed in the 1970s that bacteria might contain membrane folds termed mesosomes, but these were later shown to be artifacts produced by the chemicals used to prepare the cells for electron microscopy.
This idea is supported in the Endosymbiotic theory.
The small intestine digests nutrients and absorbs them into blood vessels.
Such nutrients include proteins, fats, and carbohydrates.
Prokaryotes are not as structurally complex as eukaryotes, and were once thought not to have any internal structures enclosed by lipid membranes.
In the past, they were often viewed as having little internal organization, but slowly, details are emerging about prokaryotic internal structures.