Which cellular structure is primarily responsible for locomotion?

Which cellular structure is primarily responsible for locomotion?

• A. Ribosome
• B. Nucleus
• C. Mitochondrion
• D. The flagellum

Answer: (D)

Locomotion in cells is produced by specialized appendages that generate thrust through motion. The flagellum acts like a tiny propeller or whip, creating propulsion that moves the cell through its fluid environment. This motion is driven by motor proteins that convert chemical energy into mechanical work, so the cell can swim or glide as needed. Other organelles you mentioned serve essential supporting roles—ribosomes make proteins, the nucleus stores and manages genetic information, and mitochondria generate the energy (ATP) that powers cellular activities. While that energy is necessary for movement, the direct driver of locomotion is the flagellum itself.

Locomotion in cells is produced by specialized appendages that generate thrust through motion. The flagellum acts like a tiny propeller or whip, creating propulsion that moves the cell through its fluid environment. This motion is driven by motor proteins that convert chemical energy into mechanical work, so the cell can swim or glide as needed. Other organelles you mentioned serve essential supporting roles—ribosomes make proteins, the nucleus stores and manages genetic information, and mitochondria generate the energy (ATP) that powers cellular activities. While that energy is necessary for movement, the direct driver of locomotion is the flagellum itself.