Question

select all that apply
chemotaxis involves ______.

• movement of bacteria away from a repellent
• no cellular appendage to confer motility
• movement of bacteria toward an attractant
• no source of energy for the movement exhibited

Explanation:

1. Chemotaxis is the movement of bacteria (or other cells) in response to chemical stimuli. Bacteria can move away from repellents (negative chemotaxis) or toward attractants (positive chemotaxis).
2. Bacteria use flagella (cellular appendages) for motility during chemotaxis, so the option about "no cellular appendage" is incorrect.
3. Movement (like chemotaxis) requires energy, so the option about "no source of energy" is incorrect.

Answer:

A. movement of bacteria away from a repellent, C. movement of bacteria toward an attractant