Multiple Choice
In the context of bacterial cell structure, which component of the flagellum is responsible for anchoring the flagellum to the cell wall and plasma membrane?
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7. Prokaryotic Cell Structures & Functions
Introduction to Bacterial Cell Walls
Multiple Choice
When a bacterial colony is present in water, what type of extracellular layer is typically produced by the bacteria?
A
Endospore
B
Capsule
C
Flagellum
D
Biofilm
Verified step by step guidance1
Understand the different types of extracellular structures produced by bacteria: Endospores are dormant, tough, and non-reproductive structures; Capsules are well-organized layers surrounding some bacteria; Flagella are tail-like structures used for motility.
Recognize that when bacteria are present in water and form a community, they often produce a complex, slimy extracellular matrix that helps them adhere to surfaces and to each other.
Identify that this extracellular matrix is known as a biofilm, which is a collective of one or more types of microorganisms that can grow on many different surfaces.
Note that a biofilm is not a single structure like a capsule or flagellum, but rather a community embedded in a self-produced extracellular polymeric substance (EPS).
Conclude that the typical extracellular layer produced by bacteria in water to form colonies is a biofilm, which provides protection and facilitates survival in aquatic environments.
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