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Describe the chemotaxis systems of bacteria. Only cells which are motile, that is, those cells which are capable of autonomous movement are able to carry out chemotaxis. The process of chemotaxis is limited to select types of specialised cells which possess the ability to detect changes in their external environment, and, as a consequence of these, to elicit changes in their internal environment which lead to whole - cell movement. Chemotaxis may be defined as "a change in the direction of movement of a motile cell in response to a concentration gradient of a specific chemical". This change in the direction of movement may either cause the cell to move towards or away from the sensed chemical. Chemicals which are capable of leading to such a response from chemotactic cells are called Chemotactants and may act as either attractants - in which case the chemotactic cell will move towards them, thereby exhibiting...

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