Which of the following structures is not found in prokaryotic cells?

Plasma membrane

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Nuclear envelope

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Ribosome

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Mesosome

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Solution

The correct option is B Nuclear envelope
Prokaryotic cells have no well-defined nucleus and hence they lack a nuclear membrane.
Prokaryotes do contain a plasma membrane, ribosomes and mesosomes (when treated with chemicals for fixing the sample for electron microscopy)

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