Final answer:
The presence of type IV pili causes a twitching movement in bacteria from the Pseudomonas genus, such as Pseudomonas aeruginosa, and is distinct from other types of bacterial motility, so the correct option is 1.
Step-by-step explanation:
The presence of type IV pili causes a type of twitching movement in the bacteria of the Pseudomonas genus, particularly noted in Pseudomonas aeruginosa.
This type of motility allows bacteria to move across surfaces. Pseudomonas aeruginosa is a Gram-negative batcillus and is known as an opportunistic pathogen that can cause a wide array of infections.
Escherichia bacteria, such as E. coli, exhibit a peritrichous flagella arrangement, but not the twitching motility associated with type IV pili.
The presence of type IV pili causes a twitching movement in bacteria, and this movement is observed in members of the Pseudomonas genus. Type IV pili are thin, elongated appendages that extend and retract, allowing bacteria to move across surfaces.
Pseudomonas aeruginosa, an opportunistic pathogen known for causing various infections, including swimmer's ear and burn wound infections, is a gram-negative bacterium that exhibits a lophotrichous arrangement of type IV pili.
So, the correct option is 1.