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What is a mesosome in a prokaryotic cell...

What is a mesosome in a prokaryotic cell ? Mention the functions that it performs.

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A special membranous structure is the mesosome which is formed by the extensions of plasma membrane into the cell. These extensions are in the form of vesicles, tubules and lamellae. They help in cell wall formation, DNA replication and distribution to daughter cells. They also help in respiration, secretion processes.
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