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Question

A is the smallest known living cell.

A
virus
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B
mycoplasma
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C
viroid
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D
E. coli
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Solution

The correct option is B mycoplasma
Mycoplasma is the smallest known living organism. It is about 200 - 300 nm in width.
Viruses are 20 nm in width. Though viruses are smaller than Mycoplasma, viruses and viroids are technically not considered to be alive.
E. coli cell is about 2 μm in length

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