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Organization and Structure of Cells
Organization and Structure of Cells

... classes): ...
Cells Powerpoint - Class on the Moon
Cells Powerpoint - Class on the Moon

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... In a constant environment, bacteria will move randomly. They can, however, exhibit directed movement toward an attractant (e.g. food) or away from a repellant (e.g. waste). This is chemotaxis. ...
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Bacteria Predominate
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Biology - UKPlatinumEssays.com

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Chemotaxis



Chemotaxis (from chemo- + taxis) is the movement of an organism in response to a chemical stimulus. Somatic cells, bacteria, and other single-cell or multicellular organisms direct their movements according to certain chemicals in their environment. This is important for bacteria to find food (e.g., glucose) by swimming toward the highest concentration of food molecules, or to flee from poisons (e.g., phenol). In multicellular organisms, chemotaxis is critical to early development (e.g., movement of sperm towards the egg during fertilization) and subsequent phases of development (e.g., migration of neurons or lymphocytes) as well as in normal function. In addition, it has been recognized that mechanisms that allow chemotaxis in animals can be subverted during cancer metastasis.Positive chemotaxis occurs if the movement is toward a higher concentration of the chemical in question; negative chemotaxis if the movement is in the opposite direction. Chemically prompted kinesis (randomly directed or nondirectional) can be called chemokinesis.
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