Chapter - 9- revised

Chapter - 9- revised - CELL COMMUNICATION AND REGULATION OF...

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Unformatted text preview: CELL COMMUNICATION AND REGULATION OF THE CELL CYCLE CHAPTER 9 A plasma membrane is essential for a cell It isolates the cell from its surroundings A cell cannot survive if it cannot sense changes in the extracellular environment and respond to them Cell communication is the process of cells detecting and responding to signals in the extracellular environment Needed to coordinate cellular activities in a multicellular organism One important reason for cell communication is to promote cell division Cell communication or cell signaling involves incoming and outgoing signals Signals are agents that influence the properties of cells Signals affect the conformation of a receptor leading to a response in the cell Why do cells need to respond to signals? 1. Need to respond to a changing environment Adaptation or a cellular response is critical for survival Glucose acts as a signal to yeast cells to increase number of glucose transporters and enzymes allowing efficient uptake and use of glucose Why do cells need to respond to signals? Cells need to communicate with each other Cell-to-cell communication Darwin and his son investigated phototropism Auxin is a signaling molecule transmitted from cell to cell and inhibited by the light Signals relayed between cells 1. Direct intercellular signaling Cell junctions allow signaling molecules to pass from one cell to another 2. Contact-dependent signaling Some molecules are bound to the surface of cells and serve as signals to cell coming in contact with them 3. Autocrine signaling Cells secrete signaling molecules that bind to their own cell...
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Chapter - 9- revised - CELL COMMUNICATION AND REGULATION OF...

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