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Which one of the following living organisms completely lacks a cell wall?

1. Cyanobacteria
2. Sea-fan (Gorgonia)
3. Saccharomyces
4. Blue-green algae

Correct answer: Sea-fan (Gorgonia)

Solution

Sea-fan (Gorgonia) is an animal (a cnidarian), and animal cells do not have cell walls. Cyanobacteria and blue-green algae are prokaryotic/algal forms with walls, and Saccharomyces is a fungus with a chitinous cell wall.

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