Multiple Choice
Which of the following statements is TRUE?
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7. Prokaryotic Cell Structures & Functions
Prokaryotic Flagellar Structure
1:58 minutesProblem 2
Textbook Question
Sketch, name, and describe three flagellar arrangements in bacteria.
Verified step by step guidance1
Step 1: Understand that bacterial flagella are whip-like structures used for motility, and their arrangement on the bacterial cell surface varies, which helps in identifying and classifying bacteria.
Step 2: Identify the first flagellar arrangement: Monotrichous. This means a single flagellum is located at one pole of the bacterium. Sketch a rod-shaped bacterium with one flagellum extending from one end.
Step 3: Identify the second flagellar arrangement: Lophotrichous. This arrangement has a cluster or tuft of flagella at one or both poles of the bacterium. Sketch a bacterium with multiple flagella grouped at one end.
Step 4: Identify the third flagellar arrangement: Peritrichous. In this case, flagella are distributed all around the surface of the bacterium. Sketch a bacterium with flagella emerging from all sides.
Step 5: For each arrangement, describe how the number and placement of flagella affect bacterial movement and how these patterns are used in microbiology to help classify and understand bacterial species.
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1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Bacterial Flagella Structure
Bacterial flagella are long, whip-like appendages used for motility. They consist of a filament, hook, and basal body, enabling rotation that propels the bacterium. Understanding this structure is essential to grasp how different arrangements affect movement.
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Prokaryotic Flagellar Structure
Monotrichous Flagellar Arrangement
Monotrichous bacteria have a single flagellum located at one pole. This arrangement allows straightforward directional movement and is common in species like Vibrio cholerae. Recognizing this helps differentiate bacterial motility types.
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Lophotrichous and Peritrichous Flagellar Arrangements
Lophotrichous bacteria possess a tuft of flagella at one or both poles, enhancing propulsion. Peritrichous bacteria have flagella distributed all over the surface, allowing versatile movement. These arrangements illustrate diversity in bacterial locomotion.
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