Which organism doesn't have a cell wall and is the smallest living cell?

Algae

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Bacteriophage

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Cyanobacteria

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Mycoplasma

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Solution

The correct option is D Mycoplasma
Mycoplasma are smallest living cells known that are capable of reproduction. They lack cell wall around their cellular membrane. Due to lack of cell wall, they are resistant to antibiotics like penicillin. They are anaerobic organisms. They can survive without oxygen.
Thus, the correct answer is 'Mycoplasma.'

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