Q: Which of the following equations best represents the relationship between flagellar rotation and bacterial movement direction?

$$\text{Run: counterclockwise rotation}$$

Question 1

Which flagellar arrangement allows bacteria to best navigate complex environments, such as mucous or tissues, and why?

Accepted Answer

Peritrichous, because flagella distributed all over the cell enable tumbling and reorientation, allowing navigation through complex environments.

Question 2

A scientist observes a bacterium with flagella located at both poles of the cell. What is the correct term for this flagellar arrangement?

Accepted Answer

Amphitrichous

Question 3

Which of the following best describes the movement produced by the endoflagella (axial filaments) in spirochetes such as Treponema pallidum?

Accepted Answer

Corkscrew rotation that allows the bacterium to burrow into tissues

Question 4

Where are the endoflagella (axial filaments) of spirochetes located?

Accepted Answer

Inside the cell membrane

Question 5

Which of the following is a function of pili in bacteria?

Accepted Answer

Gene plasmid transfer and attachment to surfaces

Question 6

A patient is diagnosed with Lyme disease. Which unique motility structure allows Borrelia burgdorferi to invade tissues?

Accepted Answer

Axial filaments (endoflagella)

Question 7

Which of the following best explains why peritrichous flagella are advantageous for E. coli in the human gut?

Accepted Answer

They enable the cell to tumble and change direction, helping it navigate the complex gut environment.

Question 8

Which structure is found in both bacteria and archaea and is primarily used for movement?

Accepted Answer

Flagella

Question 9

What is the main function of the glycocalyx (capsule) in bacteria?

Accepted Answer

Protection from desiccation and phagocytosis

Question 10

Which of the following best describes the role of hami in archaea?

Accepted Answer

Attachment to surfaces in extreme environments

Question 11

A researcher observes a bacterium that can attach to host tissues and transfer genetic material to other bacteria. Which structure is most likely responsible for both functions?

Accepted Answer

Pili

Question 12

Which of the following statements about monotrichous and peritrichous flagellar movement is correct?

Accepted Answer

Peritrichous bacteria can tumble and reorient by changing the direction of flagellar rotation, while monotrichous bacteria primarily move in straight lines.

Question 13

Which of the following best explains why spirochetes are able to penetrate host tissues more effectively than other bacteria?

Accepted Answer

Their corkscrew motion, produced by internal flagella, allows them to burrow into tissues.

Question 14

Which of the following is NOT a function of the bacterial capsule?

Accepted Answer

Motility

Question 15

A bacterium is observed to have a tuft of flagella at one end. What is the correct term for this arrangement?

Accepted Answer

Lophotrichous

Question 16

Which of the following equations best represents the relationship between flagellar rotation and bacterial movement direction?

Accepted Answer

$$	ext{Run: counterclockwise rotation}$$

Question 17

Which of the following is a key difference between bacterial flagella and archaeal hami?

Accepted Answer

Flagella are used for motility, while hami are specialized for attachment in extreme environments.

Question 18

A clinical isolate of Pseudomonas is found to have a single flagellum. Which type of movement is it most likely to exhibit?

Accepted Answer

Straight-line swimming with occasional reversals

Question 19

Which of the following best describes the function of the bacterial capsule in pathogenesis?

Accepted Answer

It protects the bacterium from being engulfed by host immune cells.

Question 20

Which of the following structures is most similar in function between bacteria and archaea?

Accepted Answer

Flagella

Cell Surface Structures and Motility in Bacteria and Archaea

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