Plasma membrane notes
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Plasma membrane notes

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Plasma membrane notes Plasma membrane notes Presentation Transcript

  • Bell Work (page 8)• How is a plasma membrane different than a cell wall?
  • Notes: Plasma Membrane (page 9)
  • Notes: Plasma Membrane (page 9)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell
  • Notes: Plasma Membrane (page 9)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out
  • Notes: Plasma Membrane (page 9)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out• All cells have a plasma membrane
  • Notes: Plasma Membrane (page 9)• Maintains the proper concentration of materials inside a cell by controlling the passage of materials in and out of the cell• Selectively permeable: allows some materials to pass through while keeping others out• All cells have a plasma membrane• Made of phospholipids plus proteins, carbohydrates, and cholesterol
  • Phospholipids• “Head” end hydrophilic (loves water)
  • Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)
  • Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)
  • Phospholipids• “Head” end hydrophilic (loves water)• “Tail” end hydrophobic (hates water)• Form a bi-layer with hydrophobic tails in the middle and hydrophilic heads pointed outward
  • Proteins• Can be attached to the surface or embedded in the membrane
  • Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane
  • Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane• Channel proteins form “tunnels” that allow substances through the membrane
  • Proteins• Can be attached to the surface or embedded in the membrane• Involved in transport through the membrane• Channel proteins form “tunnels” that allow substances through the membrane• Carrier proteins bind to substances and carry them through the membrane
  • Carbohydrates• Attached to the surface of the cell
  • Carbohydrates• Attached to the surface of the cell• Help cells to identifycells
  • Cholesterol• Embedded in membrane
  • Cholesterol• Embedded in membrane• Helps stabilize and strengthen the cell membrane
  • Cholesterol• Embedded in membrane• Helps stabilize and strengthen the cell membrane• Important in cell metabolism
  • Cholesterol• Embedded in membrane• Helps stabilize and strengthen the cell membrane• Important in cell metabolism• Hydroxyl (OH) group is oriented to the outside
  • Bell Work (page 8)• Why do all cells need a cell membrane in order to survive?• Checking: Reading WS 9.1 (blue)
  • Help Wanted Ad (page 8)• Write a help wanted ad for one of the molecules in the plasma membrane (phospholipids, proteins, carbohydrates, or cholesterol)• Include: – A job description (what the molecule will be doing) – Traits the molecule must have (what should the molecule look like? Should it be hydrophobic, hydrophilic, or both?) – Where in the cell will the molecule be working?