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1.3, 1.4 Resources
| Question | Answer |
|---|---|
| 3 components of the plasma mebrane | 1. phospholipids 2. cholesterol 3. membrane proteins |
| Describe a phospholipid | composed of a phosphate group, glycerol molecule, and two fatty acid tails |
| Describe amphipathic | having both a hydrophilic and hydrophobic region |
| Phospholipids become bilayers | non-polar tail line up to face away from water while polar heads line up to face water |
| Peripheral proteins | only on one side |
| Integral proteins | extend through completely |
| Function of membrane proteins | 1. transport 2. receptors 3. anchorage 4. cell recognition 5. intercellular joinings 6. enzymatic activity |
| Uses of cholesterol | 1. reduces fluidity in different temperatures 2. reduces permeability of solutes |
| Davson-Danielli Model | 1. phospholipid bilayer sandwiched between protein layers 2. no movement of materials 3. all membranes are not identical |
| Singer-Nicolson Model | 1. proteins are embedded throughout the phospholipid bilayer 2. includes both integral and peripheral proteins |
| Plasma membrane phrases | 1. semipermeable 2. selective |
| Concentration gradient | potential difference in particle concentration from one area to another |
| 3 types of passive transport | 1. simple diffusion 2. facilitated diffusion 3. osmosis |
| Simple diffusion | passive movement of small non-polar particles from high to low concentration |
| Facilitated diffusion | large polar substances use transport proteins to move through cell membrane |
| Osmosis | movement of water from an area of high concentration through a semipermeable membrane |
| Osmolarity | measurement of solute concentration |
| Hypertonic solutions | 1. more solute; less water 2. water leaves cell 3. cell shrinks |
| Hypotonic solutions | 1. less solute; more water 2. water enters cell 3. cell grows |
| Isotonic solutions | 1. equal solute and water 2. equal movement 3. cells stays the same size |
| Medical procedures where osmolarity is important | 1. IV lines 2. organs and tissues in surgeries |
| Which axis on a graph determines a solution's concentration? | x-axis |
| Formula of percent change (mass) of a substance | ((final mass-initial mass)/initial mass)x100 |
| Distinguish passive and active transport | Passive: does not use ATP and goes with the concentration gradient Active: uses ATP and goes against the concentration gradient |
| Active transport | 1. uses ATP 2. moves against the concentration gradient 3. uses a protein pump |
| Structure of sodium potassium pump | carrier protein pump |
| Function of sodium potassium pump | moves Na+ and K+ against a concentration gradient |
| Transportation of secretory proteins | 1. secretory proteins made at Rough ER 2. placed in vesicle 3. packaged and modified at Golgi apparatus 4. placed in vesicle 5. move to plasma membrane 6. leave via exocytosis |
| What property of the cell membrane allows exocytosis and endocytosis to occur? | fluidity |
| Exocytosis | vesicle fuses with plasma membrane and contents are secreted out |
| Endocytosis | materials are brought into the cell, creating a vesicle inside |
Created by:
luciepike
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