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Cell Membrane Test
Biology 1 Honors/Vieira
| Question | Answer |
|---|---|
| Homeostasis | The process of maintaining balance inside a cell |
| Selective Permeability | The feature of the plasma membrane that keeps some substances out, and allows glucose and oxygen to move in. |
| Plasma Membrane | A boundary between the cell and its environment, maintains selective permeability and homeostasis. |
| What separates prokaryotic and eukaryotic cells from the watery environment in which they exist? | Plasma membrane |
| What makes up most of the molecules in the plasma membrane? | Lipids |
| Which molecule has a glycerol backbone, two fatty acid chains, and a phosphate-containing compound? | Phospholipid |
| What moves substances though the plasma membrane? | Transport Proteins |
| What do you call two layers of phospholipids arranged tail-to-tail? | Phospholipid bilayer |
| What is the phospholipid "sea" in which embedded substances float called? | Fluid mosaic model (fluid lipids where proteins can move) |
| What moves small molecules across the plasma membrane using transport proteins? | Facilitated diffusion |
| What involves water moving across the plasma membrane to the side with the greater solute concentration? | Osmosis |
| What occurs when substances move against the concentration gradient; requires energy and the aid of carrier proteins? | Active Transport (Requires ATP) |
| What occurs when the plasma membrane surrounds a large substance inside the cell and moves it outside the cell? | Exocytosis(Requires ATP) |
| What is the condition that results when diffusion continues until the concentrations are the same in all areas? | Dynamic Equilibrium |
| What occurs when the plasma membrane surrounds a large substance outside the cell and moves it inside the cell? | Endocytosis(Requires ATP) |
| What type of solution has the same osmotic concentration as a cell's cytoplasm and doesn't shrink or swell a cell? | Isotonic Solution |
| What solution causes a cell to shrivel and causes water to move out of a cell? | Hypertonic Solution |
| What solution causes a cell to swell and has more water outside the cell than inside the cell? | Hypotonic Solution |
| What is diffusion? | The movement of a molecule from an area of high concentration of the molecule to an area with a lower concentration. |
| What is facilitated diffusion? | The diffusion of solutes through transport proteins in the plasma membrane. |
| What is osmosis? | It's the diffusion of water |
| In which direction does water move across membranes? | Down the concentration gradient |
| What type of solution has a lower solute concentration? | Hypotonic |
| What type of solution does plant cells require? | Hypotonic |
| What type of solution does an animal cell require? | Isotonic |
| What is cytolisis? | When a cell bursts (Animal cells only) |
| What is plasmolysis? | When a plant cell loses turgor pressure |
Created by:
ohyeahtas
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