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HCC Bio101 Topic 10
Plasma Membrane (Fall 2011) Berlyn
| Question | Answer |
|---|---|
| What portions of the phospholipid are hydrophilic and water-soluble? | The glycerol and phosphate portions |
| What portion of the phospholipid is hydrophobic and not water-soluble? | The fatty acid hydrocarbon chains |
| Which direction are the hydrophilic heads of the phospholipids pointing? | The point outward because they are attracted to water |
| Which way are the hydrophobic tails pointed? | They are pointed inward because they are repelled by the water |
| What is the structure of the cell membrane called? Why? | The "Fluid Mosaic" model, because the proteins are embedded in the membrane similar to tiles in a mosaic |
| what is diffusion? | The net movement of molecules from an area of higher concentration to an area of lower concentration |
| What is osmosis? | Diffusion of water through a plasma membrane |
| What is facilitated transport? Does it require energy? | Using a carrier molecule (a transport protein) to move molecules that are large, hydrophilic or that have a charge through the plasma membrane. Since the movement is WITH diffusion, it does not require Energy. |
| What is Active Transport? Does it require energy? | Using a carrier molecule (a transport protein) to move molecules that are large, hydrophilic or that have a charge across the plasma membrane. Since the movement is opposite the direction of diffusion, energy (in the form of ATP) is required. |
| Which of the following molecules can diffuse across the plasma membrane? Water, protein, sugar, O2, ions, CO2, Lipid | Water, O2, CO2 and lipids |
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