Multiple Choice
Which of the following statements is true about organisms in the domain Bacteria?
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1. Introduction to Microbiology
Members of the Bacterial World
Multiple Choice
All of the following are used by bacteria to attach to host cells except:
A
Flagella
B
Adhesins
C
Fimbriae
D
Capsules
Verified step by step guidance1
Step 1: Understand the role of bacterial structures in attachment to host cells. Bacteria use specific surface components to adhere to host tissues, which is crucial for colonization and infection.
Step 2: Review the functions of each listed structure: Adhesins are molecules that specifically bind to host cell receptors; Fimbriae (or pili) are hair-like appendages that facilitate attachment; Capsules are polysaccharide layers that can help in adherence and protection.
Step 3: Consider the function of flagella. Flagella primarily provide motility, allowing bacteria to move toward favorable environments, but they are not primarily involved in attachment to host cells.
Step 4: Compare the roles and identify which structure does not contribute to attachment. Since flagella are mainly for movement, they are the exception among the options given.
Step 5: Conclude that the correct answer is flagella because it is not used by bacteria to attach to host cells, unlike adhesins, fimbriae, and capsules.
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