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The smallest known living cell is

AMycoplasma
BEscherichia coli
CHuman red blood cell
DYeast
Answer & Solution
Correct answer: A. Mycoplasma
Mycoplasma cells, only about 0.3 μm across, are the smallest known cells. They lack a cell wall, which is why they can be so tiny. Compare with typical bacteria at 3-5 μm and animal cells at 10-20 μm.
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