which observation is evidence that a unicellular organism is not a eukaryote?
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a. the cell lacks a large central vacuole.
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b. the golgi apparatus in the cytoplasm forms vesicles.
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c. the ribosomes in the cytoplasm assemble proteins.
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d. the cell lacks a membrane-covered nucleus.
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The cell lacks a membrane-covered nucleus.

Explanation:

All eukaryotes have a nuclear membrane. Prokaryotes lack membrane-covered nucleus and therefore their hereditary material is suspended in the nucleus. The hereditary material of eukaryotes is contained in the nucleus.

Both the prokaryotes have ribosomes for protein assembling and translation, Golgi apparatus that form vesicles for packaging of cellular synthesized materials.

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