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17 Cards in this Set
- Front
- Back
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Cell Cell communication in:
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-Multicellular organisms
-unicellular organisms(bacteria,yeast) |
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Special about Cell Cell communication in Yeast
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mating factor detection
-cells stop cell division and prepare for DNA exchange |
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Signaling Cells
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Produce signal molecules.
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Target cells
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Detect the signal molecule and respond to the signal
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SIgnal transduction
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conversion of extracelular signal to intracellular signal
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Signals can be sent over..
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Over a long or short range via:
-Paracrine, endocrine, neural, contact dependent. |
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Contact dependent signaling
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controls nerve cell production in drosophila fruit fly
Contains: membrane bound inhibitory signal protein(Delta) and receptor protein(notch) |
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Cells respond to...
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A limited set of signals, depending on history and current state.
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What is special about acetocholine?
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Various responses are induced by it
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Response to signal molecules
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-receptor
-intracellular signaling molecules -effector proteins ---these are all different consequences! |
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A typical cell...
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Has many types of receptors
-no signal = death(apoptosis) |
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Cells are sensistive
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to many different extracellular signals
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A small number of
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signal molecules can work in combination, exerting subtle and complex control.
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Stimuli can cause cell to...
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Survive, grow and divide, differentiate.
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Speed of cell response
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Fast or slow
-Fast: Altered protein function (pre-existing) Slow: Requires Protein synthesis |
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Two classes of extracellular signal molecules
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-molecules that cannot penetrate the plasma membrane(large/ charged)..cell surface receptor.
-Molecules can penetrate the membrane(small/hydrophobic)..intracellular receptor. |
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types of signaling molecules
(7) |
-protein, peptide, Amino acid, nucelotide,steroid, FA derivative,dissolved gasses
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