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CELL (PLASMA) MEMBRANEChapter 4
Pg. 77-78
Homeostasis
• Balanced internal conditions of cells• Maintained by cell membrane controlling what enters or leaves cell.
Cell (Plasma) Membrane• Function:
• Protective barrier• Semi-permeable: Regulated transport of molecules in and out of
cell
Cell (Plasma) Membrane• Function:
• Protective barrier• Semi-permeable: Regulated transport of molecules in and out of
cell • Allow cell recognition• Interact with the environment
Structure1. Phospholipid Bilayer - Two layers of phospholipids
Structure1. Phospholipid Bilayer - Two layers of phospholipids
a) Phospholipid contains:o 2 fatty acid chains that are nonpolar (hydrophobic)o Polar head (hydrophilic)
Structure1. Phospholipid Bilayer - Two layers of phospholipids
a) Phospholipid contains:o 2 fatty acid chains that are nonpolar (hydrophobic)o Polar head (hydrophilic)
b) Fatty acid tails create a hydrophobic center
Membrane Structure2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane
Membrane Structure2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane• Receptor Proteins: binds to substances outside the
cell
Membrane Structure2. Membrane Proteins-embedded in the lipid layer
a. Integral Proteins: extend through both sides of membrane• Receptor Proteins: binds to substances outside the cell• Transport (channel) Proteins: Aids in moving
substances across membrane• Glycoproteins (with Carbs): cell identification
Membrane Structure2. Membrane Proteins-embedded in the lipid layer
b. Peripheral Proteins: only on one side of membrane
-Enzymes (assist in chemical reactions)
Membrane Structure3. Cholesterol in bilayer for strength
• Blue Biology Textbook• Draw Figure 4-10 Pg. 77• Draw Figure 4-11 Pg. 78• Cell membrane coloring