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B
Mesosome
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C
Ribosome
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D
Mitochondria
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Solution
The correct option is B Mesosome Bacterial cells are primitive cells hence, are called as prokaryotic cells. They do not possess membrane-bound organelles as mitochondria, Golgi complex etc. The processes which are carried out by such specialised organelles are carried over by plasma membrane of bacteria. The plasma membrane is a living membrane that forms the boundary between a cell and its environment. Some invaginations of the plasma membrane are called as mesosomes which are involved in the process of aspiration and called as a respiratory centre.