| A | B |
|---|
| Plasma membrane | The outer boundary of a cell, it encloses the cell's contents |
| Selectively permeable membrane | Only certain molecules were able to pass through, or permeate the membrane |
| Fluid mosaic model | The current model of membrane structure |
| Diffusion | Random movement of ions and other particles |
| Dynamic equailibrium | A condition where there is continuous movement but no overall change |
| Passive transport | The movement of particles across the membrane |
| Transport protiens | The proteins that play a role in the passage of particles |
| Facilitated diffusion | The use of transport proteins to aid, or facilitate, the passage of particles across the plasma membrane |
| Active transport | A process in which the cell's energy is required to move particles across the plasma membrane |
| Endocytosis | The process by which the plasma membrane engulfs and then takes in substances from a cell's enviornment |
| Vesicle | The portion of the membrane that forms the border of a small sac |
| Pinocytosis | The form of endocytosis in which liquid droplets are taken in |
| Phagocytosis | The form of endocytosis in which liquid droplets are taken in |
| Exocytosis | The reverse process of endocytosis; is used to rid some cells of wastes such as undigestible particles or secrete substances |
| Cell wall | A structure that plants, most algae, fungi, and bacteria have |
| Tissue | A group of cells that have the same basic structure and function |
| Organ | A structure composed of many different tissues that work together to perform a particular function |
| System | A group of organs that work together |
| Metabolism | Sum of all chemical changes in cells |
| Eukaryotes | Cells that possess a membrane bound organelle called a nucleus |
| Prokaryotes | Cells that do not have a membrane bound nucleus |
