Which one of the living organisms completely lacks a cell wall
A
Sea Fan
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B
Saccharomyces
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C
Blue-green algae
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D
Cyanobacteria
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Solution
The correct option is C Sea Fan All species in the Animal kingdom are multi-cellular; the cells of these species have a nucleus but no cell wall. As Sea Fan classifies itself as a Phylum, it lacks a cell wall.
Moreover, organisms such as Saccharomyces are from the kingdom Fungi, making its wall full of chitin, since many species in this kingdom are of yeast. As for Cyanobacteria and Blue-green algae, it belongs to the kingdom Monera, making its cell wall full of peptidoglycan, in a thick layer.