AP Biology: Cell Communication

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What are second messengers in cell communication?

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Second messengers are small, water-soluble molecules that relay signals received at receptors on the cell surface to target molecules inside the cell, facilitating rapid cellular responses.

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What is the role of signal transduction pathways?

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Signal transduction pathways are processes by which a cell responds to external signals, leading to various cellular responses such as growth, gene expression, and secretion of molecules.

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What is a target cell?

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A target cell is a cell that has specific receptors for a particular signaling molecule, allowing it to respond to that signal.

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What is the function of protein kinases?

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Protein kinases are enzymes that transfer phosphate groups from ATP to specific proteins, thereby activating or deactivating them and regulating cellular activities.

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What is the significance of signal receptors?

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Signal receptors are proteins located on the cell surface or inside the cell that bind to signaling molecules, initiating a cellular response.

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What is cAMP and its role in cell signaling?

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cAMP (cyclic adenosine monophosphate) is a second messenger that transmits signals from receptors to target molecules within the cell, often activating protein kinases.

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What is a phosphorylation cascade?

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A phosphorylation cascade is a series of chemical reactions in a cell where one enzyme phosphorylates another, leading to a chain reaction that amplifies the signal.

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What is the difference between protein kinases and protein phosphatases?

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Protein kinases add phosphate groups to proteins, while protein phosphatases remove phosphate groups, thus regulating protein activity.

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What is the role of G proteins in cell signaling?

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G proteins are molecular switches that transmit signals from activated receptors to other proteins inside the cell, playing a crucial role in signal transduction.

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What is gene expression in the context of cell signaling?

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Gene expression is the process by which information from a gene is used to synthesize functional gene products, often regulated by signaling pathways.