| A | B |
|---|
| active transport | process requiring energy by which cells move materials across the plasma membrane |
| contractile vacuole | organelle that collects excess water and expels it through a plasma membrane pore |
| diffusion | net, random movement of particles from an area of higher concentration to lower |
| dynamic equilibrium | movement of materials into and out of a cell are equal |
| endocytosis | active transport process by which large particles enter a cell |
| exocytosis | active transport process by which large particles are moved out of a cell |
| facilitated diffusion | passive transport of materials across a cell membrane by way of transport proteins |
| fluid mosaic model | property of plasma membrane wherein molecules are free to move sideways in the plasma membrane |
| hypertonic solution | concentration of dissolved materials is higher outside of cell |
| hypotonic solution | concentration of dissolved materials is lower outside of cell |
| isotonic solution | concentration of dissolved materials is equal inside and outside of cell |
| osmosis | diffusion of water molecules across a selectively permeable membrane |
| passive transport | movement of particles across cell membrane requiring no energy |
| phospholipid | membrane lipid having an organic section attached to a phosphate group |
| plasmolysis | process resulting in shrinking of plasma membrane |
| selective permeability | property of a plasma membrane wherein needed materials are allowed in and harmful materials are not |
| transport protein | channel proteins and carrier proteins embedded in the plasma membrane |
| turgor pressure | internal pressure in a cell due to water held by osmotic pressure |
