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membrane + transport
Cell membrane and methods of transport
| Question | Answer |
|---|---|
| active transport | movement of materials across a membrane that requires an input of energy from a cell |
| cell membrane | Also known as the plasma membrane and composed of a bilayer of phospholipids |
| concentration gradient | the region over which there is a change in concentration of a substance |
| endocytosis | the movement of materials into a cell by use of a vesicle |
| exocytosis | the movement of materials out of a cell by use of a vesicle |
| hydrophilic | water loving; soluble in water |
| hydrophobic | water hating; not soluble in water |
| osmosis | the diffusion of water across a semipermeable membrane |
| passive transport | movement of materials across a membrane that does not require energy from the cell |
| phospholipid bilayer | the double layer of phospholipids that makes up the membranes of a cell |
| diffusion | process in which atoms and molecules move from an area where they are more concentrated to an area where they are less concentrated |
| semipermeable | permeable to some molecules, but not to others |
| phospholipids | the type of molecule that makes up the bulk of the cell membrane |
| cholesterol | helps hold the phospholipids together in the membrane |
| fluid mosaic model | a description of the cell membrane |
| protein channels | Help molecules get into and out of the cells |
Created by:
Mrs. betzenberger
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