Biology 1 - Chapter 9

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Biology 1 - Chapter 9
2013-11-10 23:41:56
Biology Chapter

Biology 1 - Chapter 9
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  1. Define a Signal Transduction Pathway
    A group of proteins that convert an initial signal to a different signal inside a cell
  2. Direct Cell Signaling
    Cell junctions allow signaling molecules to pass from one cell to another adjacent cell
  3. Contact Dependent Signaling
    Membrane bound signals bing to receptors on adjacent cells
  4. Autocrine Signaling
    Cells release signals that affect themselves and nearby cells
  5. Paracrine Signaling
    Cells release signals that affect nearby cells
  6. Endocrine Signaling
    Cells release signals that travel long distances t affect target cells.
  7. What does a Ligand refer to?
    A signaling molecule
  8. What are the 3 kinds of Cell Surface Receptors
    • 1. Enzyme-Linked Receptors: Have some catalytic function. Many of them are protein kinases (enzymes that transer Pi from ATP to specific AAs in a protein) that phosphorylate proteins.
    • 2. G-Protein-coupled Receptors: Interact with G proteins to initiate a cellular response
    • 3. Ligand-Gated Ion Channels: Receptors that allow the flow of ions across a cellular membrane.
  9. Define Growth Factor
    Signaling molecule that promote cell division