Plasma membrane notes
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Here is a draft help wanted ad for phospholipids in the plasma membrane: Wanted: Phospholipids for plasma membrane Job description: Form a protective bi-layer around the cell to regulate what comes in and out. Use hydrophilic heads and hydrophobic tails to create a selective barrier. Traits: Must have both hydrophilic and hydrophobic regions. Hydrophilic head to interact with water-based solutions outside and inside the cell. Hydrophobic tail to interact with other phospholipid tails in the membrane interior. Location: Embedded in the plasma membrane surrounding the cell, with heads facing the intracellular and extracellular environments.
Plasma membrane notes
- 1. Bell Work (page 8) How is a plasma membrane different than a cell wall?
- 2. Notes: Plasma Membrane (page 9)
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. Phospholipids Head end hydrophilic (loves water)
- 8. Phospholipids Head end hydrophilic (loves water) Tail end hydrophobic (hates water)
- 9. Phospholipids Head end hydrophilic (loves water) Tail end hydrophobic (hates water)
- 10. 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
- 11. Proteins Can be attached to the surface or embedded in the membrane
- 12. Proteins Can be attached to the surface or embedded in the membrane Involved in transport through the membrane
- 13. 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
- 14. 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
- 15. Carbohydrates Attached to the surface of the cell
- 16. Carbohydrates Attached to the surface of the cell Help cells to identifycells
- 17. Cholesterol Embedded in membrane
- 18. Cholesterol Embedded in membrane Helps stabilize and strengthen the cell membrane
- 19. Cholesterol Embedded in membrane Helps stabilize and strengthen the cell membrane Important in cell metabolism
- 20. Cholesterol Embedded in membrane Helps stabilize and strengthen the cell membrane Important in cell metabolism Hydroxyl (OH) group is oriented to the outside
- 21. Bell Work (page 8) Why do all cells need a cell membrane in order to survive? Checking: Reading WS 9.1 (blue)
- 22. 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?