CAS BI 108 Chapter Notes - Chapter 7: Signal Transduction, Transcription Factor, Multicellular Organism

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16 Feb 2014
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This information can be in the form of a physical stimulus or a chemical stimulus. Information may come from outside the cell or from another cells: to respond to a signal, a cell must have a specific receptor that can detect it and a way to use that information to influence cellular processes. Signal transduction pathway: a sequence of molecular events and chemical reactions that lead to a cell"s response to a signal. Autocrine: signals diffuse to and effect cells that make them; ex-tumor cells because they make and respond to signals that stimulate cell division. Juxtacrine: signals affect only cells adjacent to the cell producing the signal; ex-development. Paracrine: signals diffuse to and affect nearby cells; ex-neurotransmitter made by one nerve cell that diffuses to nearby cell and stimulates it. Hormones: signals that travel through the circulatory system in animals or vascular system of plants. A signal transduction pathway involves a signal, a receptor, and responses.

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