The correct statement is:
Prokaryotic cells lack membrane-bound organelles, whereas eukaryotic cells have membrane-bound organelles.
To clarify the other options:
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Eukaryotic cells do not have ribosomes but prokaryotic cells do have ribosomes. - This is incorrect; both eukaryotic and prokaryotic cells have ribosomes.
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Eukaryotic cells are generally smaller than prokaryotic cells. - This is incorrect; eukaryotic cells are generally larger than prokaryotic cells.
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Prokaryotic cells contain a nucleus, while eukaryotic cells do not contain a nucleus. - This is incorrect; prokaryotic cells do not have a nucleus, while eukaryotic cells do have a nucleus.