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Prokaryotes generally possess a cell wall surrounding the plasma membrane, but Mycoplasma is an exception and lacks a cell wall.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model
Mycoplasmas are exceptionally unique microorganisms within Kingdom Monera. According to NCERT Class 11 Biological Classification, they completely lack a rigid cell wall, which makes them highly pleomorphic. More importantly, they are definitively recognized as the smallest living cells discovered so far. Furthermore, they can survive in entirely anaerobic environments (without oxygen) and many species are significant pathogens causing diseases in both animals and plants.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.1 Kingdom Monera
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