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Ch.5 Plasma Membrane
| Question | Answer |
|---|---|
| What are the 4 components of the plasma membrane? | The phospholipid bilayer, cholesterol, protein and glycocalyx |
| Explain one function of the plasma membrane: | Keeping the goods concentrated, while keeping harmful material out. |
| Explain the second function of a plasma membrane: | communicating with other cells |
| What is osmosis? | The net movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. |
| What is diffusion? | The movement of molecules from a region of high concentration to low concentration. |
| What are the four functions of a protein? | Structural support (attach to cytoskeleton), recognition (helps immune system determine itself from foreign objects), communication (receptors and binding sites), and transport (allow molecules to pass) |
| Describe coupled reaction: | Where one reaction requires energy, and the other produces energy. |
| Explain exocytosis: | Movement of materials out of the cell by fusion of vesicles with the plasma membrane. |
| Explain endocytosis: | Infolding of the plasma membrane to bring large materials into the cell. |
| List the 3 forms of endocytosis: | Pinocytosis, receptor- mediated endocytosis, and phagocytosis. |
| What is pinocytosis? | Cell drinking |
| What is receptor- mediated endocytosis (RME)? | Receptor capturing ligand and concentrating into an invaginating pit. |
| What is phagocytosis? | Cell eating |
| Explain phagocytosis: | How the human immune system ingests whole bacteria. |
| Explain pinocytosis: | Water and solvents are enclosed in an invaginating vesicle, used in digestive tract. |
| What is a phospholipid? | 2 fatty acid chains and a polar phosphate group attached to the glycerol. |
| What's the arrangement of phospholipids in water? | 2 layers: heads pointing out & the tails pointing in. |
| What is cholesterol? | Prevents passage of some small molecules and adds fluidity. |
| What are the 2 main types of transport? | Passive transport the membranes travel down the concentration gradient and enter w/out energy output by cell. And active transport the membrane travels up the concentration gradient w/ energy from ATP. |
Created by:
Jalisha_02
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