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| Description: a) In the absence of either attractants or repellents, the bacterium stops and tumbles frequently, each time starting out in a new, random direction. b) When a gradient of an attractant is present, a bacterium heading toward the attractant tends to run for longer periods without tumbling. c) A gradient of a repellent has the opposite effect, favoring long runs away from the repellent source. Picture Stats: Views: 204 Filesize: 98.19kB Height: 861 Width: 462 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34171 |