The organism which completely lack a cell wall and can live without oxygen are

Archaebacteria

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Thermoacidophiles

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Mycoplasmas

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Methanogens

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Solution

The correct option is B Mycoplasmas
The Mycoplasmas lack the cell wall and the mycoplasmas are facultative anaerobes, except for M. pneumonae.
They may be parasitic or saprophytic.
They are unaffected by the antibiotics that stop the cell wall synthesis.
Hence, the correct answer is option (C).

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