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What organism lacks cell wall?

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What organism lacks cell wall?

(a) Plant cells

(b) Protozoa

(c) Bacterial cells

(d) Algae

This question was posed to me at a job interview.

My question comes from Extracellular Matrix and Cell Interactions topic in portion Extracellular Matrix and Cell Interactions of Cell Biology

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Correct choice is (b) Protozoa

The best I can explain: The animal cells and the protozoa lacks cell wall. They only contain cell membrane followed by the cytoplasm. Because of this they do not have a rigid shape.

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