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Answer for the clue "Movement by a cell or organism in reaction to a chemical stimulus ", 10 letters:
chemotaxis

Word definitions for chemotaxis in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Chemotaxis \Chem`o*tax"is\, n. Formerly also Chemiotaxis \Chem`i*o*tax"is\ [Chemical + Gr. ? arrangement, fr. ? to arrange.] (Biol.) The sensitiveness exhibited by small free-swimming organisms, as bacteria, zo["o]spores of alg[ae], etc., to chemical substances ...

WordNet Word definitions in WordNet
n. movement by a cell or organism in reaction to a chemical stimulus

Wiktionary Word definitions in Wiktionary
n. (context biology biochemistry English) the movement of a cell or an organism in response to a chemical stimulant

Wikipedia Word definitions in Wikipedia
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. ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1891, coined in German, 1888, by German botanist Wilhelm Pfeffer (1845-1920) from chemo- + Greek taxis "arrangement" (see tactics ).

Usage examples of chemotaxis.

Micro-organisms, generally, display a negative chemotaxis, which enables them to respond to a deleterious alteration in the • We think with sardonic amusement of the moth who seems so stupidly to fly into a flame that kills it, but movement toward the light is generally adaptive behavior.