Multiple choice Which of the following do not belong to kingdom 'Protists'? Algae Diatoms Protozoan Mycoplasma Reveal answer Fill a bubble to check yourself D Correct answer Explanation Mycoplasma belongs to the kingdom Monera (bacteria), not Protists. Algae, Diatoms, and Protozoans are all members of the Protist kingdom. Mycoplasma is unique among bacteria as it lacks a cell wall.