Cells can move toward or away from stimuli {taxis}|. Single-cell organisms can move toward or away from oxygen (aerotaxis, in bacteria), molecules (chemotaxis, in bacteria and protozoa), gravity (geotaxis, in protozoa), light (phototaxis, in phytoflagellates and protozoa), and contact (thigmotaxis).
Organisms can change activity (kinesis) in response to stimulus. Organisms can grow (tropism) toward or away from stimuli.
Biological Sciences>Cell>Movement
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Date Modified: 2022.0224