Multiple Choice
Which explanation best accounts for the differences in bacterial movement between pattern A (smooth swimming) and pattern B (tumbling)?
7. Prokaryotic Cell Structures & Functions
Prokaryotic Flagellar Movement
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"Tumbles"and straight-line "runs"are associated with:
A
The action of fimbriae.
B
How a pilus transfers DNA.
C
Flagellar motility.
D
Twitching motility.
E
None of the above.
Verified step by step guidance1
Understand the context: The problem is asking about the mechanisms associated with 'tumbles' and 'straight-line runs'. These terms are related to bacterial movement.
Identify the key terms: 'Tumbles' and 'straight-line runs' are specific behaviors observed in bacterial motility, particularly in how bacteria move in response to stimuli.
Recall the concept of flagellar motility: Bacteria use flagella, which are whip-like structures, to move. This movement is characterized by alternating between 'runs' (straight-line movement) and 'tumbles' (random changes in direction).
Differentiate between the options: Fimbriae are used for attachment, not movement. Pili are involved in DNA transfer, not motility. Twitching motility involves pili, not flagella.
Conclude with the correct association: Based on the understanding of bacterial movement, 'tumbles' and 'straight-line runs' are associated with flagellar motility.
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