Multiple Choice
To date, most of our natural antibiotics have been found to be produced by members of which bacterial genus?
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1. Introduction to Microbiology
Members of the Bacterial World
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Spirochetes are able to move due to which of the following structures?
A
Pili
B
Axial filaments (endoflagella)
C
Cilia
D
Fimbriae
Verified step by step guidance1
Understand that spirochetes are a unique group of bacteria characterized by their spiral shape and distinctive mode of motility.
Recall that typical bacterial motility is often due to flagella, but spirochetes have a specialized form called axial filaments or endoflagella.
Axial filaments are located between the outer sheath and the cell wall, wrapped around the length of the spirochete, allowing it to move in a corkscrew motion.
Differentiate axial filaments from other structures like pili, fimbriae, and cilia, which serve different functions such as attachment or sensory roles, but not motility in spirochetes.
Conclude that the structure responsible for spirochete motility is the axial filament (endoflagella), enabling their characteristic movement.
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