| key concept7.1Signals and Signaling Affect Cell Function
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| Cells receive several types of signals
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| A signal transduction pathway involves a signal, a receptor, and responses: Overview
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| key concept7.2Receptors Bind Signals to Initiate a Cellular Response
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| Receptors that recognize chemical signals have specific binding sites
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| Receptors can be classified by location and function
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| Intracellular receptors are located in the cytoplasm or the nucleus
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| key concept7.3The Response to a Signal Spreads through the Cell
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| The cell amplifies its response to ligand binding
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| Second messengers can amplify signals between receptors and target molecules
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| Signal transduction is highly regulated
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| key concept7.4Cells Change in Response to Signals in Several Ways
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| Ion channels respond to signals by opening or closing
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| Enzyme activities change in response to signals
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| Signals can initiate DNA transcription
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| key concept7.5Adjacent Cells in a Multicellular Organism Can Communicate Directly
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| How do animal cells directly communicate?
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| Plant cells communicate through plasmodesmata
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| Modern organisms provide clues about the evolution of cellâcell interactions and multicellularity
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| Apply What Youâve Learned
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