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The smallest known cell As per your syllabus, is
AMycoplasma at about 0.3 μm
BE. coli at about 3 μm
Ca red blood cell at 7 μm
Da virus at about 0.1 μm
Answer & Solution
Correct answer: A. Mycoplasma at about 0.3 μm
Mycoplasma at 0.3 μm is the smallest known cell.
Viruses are smaller but are NOT cells (cannot reproduce alone, lack cellular machinery), so they fall outside cell theory entirely.
E. coli is several μm; RBCs are bigger still.
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