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A capsule is a protective, gelatinous layer that surrounds the cell wall of some prokaryotes. It helps bacteria evade the host immune system and adhere to surfaces.
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Cell Wall: Provides structural support and shape to the cell, located beneath the capsule in some bacteria.
Flagella: Long, whip-like structures used for movement by many prokaryotic cells.
Biofilm: A complex community of microorganisms adhering to surfaces, often protected by an extracellular matrix including polysaccharides.