AST Surgical Technologist Practice Exam

What term describes the thread-like appendages that provide bacteria with motion?

1. Flagella

2. Cilia

3. Pseudopodia

4. Fimbrae

The correct answer is: Flagella

The term that describes the thread-like appendages providing bacteria with motion is flagella. Flagella are long, whip-like structures that enable bacteria to swim through liquid environments. These appendages rotate and can propel the bacterial cell forward, allowing it to navigate towards nutrients or away from harmful substances. Cilia are similar structures, but they are typically found in eukaryotic cells and allow for more coordinated movement across surfaces rather than providing motility for individual cells like bacteria. Pseudopodia are extensions of the cytoplasm used by certain eukaryotic organisms, such as amoebas, for movement and feeding, but they do not constitute a true structure for locomotion in bacteria. Fimbrae are short, hair-like structures that help bacteria adhere to surfaces but do not aid in movement. Thus, flagella is the specific structure associated with bacterial motility.