Which of these lack a cell wall?

Dinoflagellates

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Actinomycetes

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Cyanobacteria

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Mycoplasma

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Solution

The correct option is D Mycoplasma
Dinoflagellates are photosynthetic eukaryotic organisms and have a cell wall made of cellulose.
Actinomycetes are bacteria with a cell wall made of muramic acid.
Cyanobacteria have a gelatinous cell wall.
Mycoplasmas are pathogenic bacteria that have no cell walls. Hence they are resistant to antibiotics that target cell wall synthesis mechanisms in bacteria.

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