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Unit 4 Test -- Bio
The Cell Membrane and cellular transport
| Question | Answer |
|---|---|
| What is the function of the plasma membrane? | To maintain homeostasis. |
| _____ can freely enter the cell directly through the plasma membrane. | Water |
| What is a phospholipid composed of? | Glycerol, 2 fatty acids, and a phosphate. |
| The plasma membrane consists of ___ layers of phospholipids with ________ __________ on the inside, and __________ on the outside | Two, Non-polar Fatty acids, Polar heads |
| The _____ of the phospholipid are nonpolar | Tails |
| The _____ of the phospholipid are polar | Heads |
| Because water is polar, the ____ of the phospholipid is able to interact with its watery enviroment | Head |
| Because water is polar, the _____ of the phospholipid avoid water. | Tails |
| The structure of the membrane creates a barrier that is water-_______ at is outer surfaces and water-_________ in the middle. | Soluble (hydrophilic),(hydrophobic) |
| The Fluid Mosaic Model suggests that phospholipids ___________ | move within the membrane |
| The Fluid Mosaic Model suggests that proteins _________ | Move along the phospholipids |
| What role does cholesterol play in the cell membrane? | They stableize phospholipids |
| How do cells identify chemical signals and each other? | Identifying proteins |
| Due to proteins in the middle of the membrane, the cell is _________ | Flexable |
| Why does water move into a cell? | To reach equilibrium. |
| Without using energy, water moves from a ____ concentration to a ____ concentration. | High to Low |
| Water moving from a low to a high concentration is moving _________ the concentration gradient. | against |
| Which types of cells are affected by osmosis because they are surrounded by water solutions. | both animal and plant |
| When is equilibrium reached? | When both sides of the membrane is equal |
| In a hypertonic solution, the concentration of dissolved particles is greater on the _______ of the cell. | Outside |
| Does passive transport require energy from the cell? | No |
| In passive transport, substances move from a ____ concentration to a ___ concentration. | High to low |
| How do channel proteins help molecules enter the cell? | They create channels |
| How do carrier proteins help molecules enter the cell? | They carry it |
| ______ transport requires an energy input from the cell. | Active |
| In active transport, substances move from a ___ concentration to a ____ concentration. | Low to High |
| What process is used to take large molecules into a cell? | Endocytosis |
| What process is used to expel waste from a cell? | Exocytosis |
| The flexible boundary between the cell and its environment. | Plasma Membrane |
| The process of maintaining balance in the cells environment. | Homeostasis |
| Double layer of phospholipids. | Plasma Membrane |
| Move needed material or waste through the plasma membrane. | Transport proteins |
| Movement of particles from an area of higher to lower concentration | Diffusion |
| The diffusion of water molecules. | Osmosis |
| unequal distribution of particles | Concentration Gradient |
| The point at which the concentration of water is equal on both sides of membrane | equalibrium |
| Movement of particles across the plasma membrane in the same direction of the concentration gradient | Passive Transport |
| Passive transport using transport proteins | Facilitated diffusion |
| Movement of particles across the membrane on the opposite direction as the concentration gradient | active transport |
Created by:
nickolasbaldwin
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