| A | B |
|---|
| Environment | the surroundings |
| Diffusion | movement of molecules from an area of high concentration to an area of low concentration |
| Kinetic energy | energy of movement |
| Permeable | allowing substances to pass through |
| Impermeable | blocking the movement of substances, not allowing passage of substances |
| Osmosis | the movement of water through a selectively permeable membrane |
| Selectively permeable membrane | a barrier that permits some substances to pass through but blocks others |
| Active transport | the movement of particles through a membrane by use of energy |
| Passive transport | the movement of particles through a membrane without the use of energy |
| Transport proteins | proteins in the cell membrane that can pick up particles on one side of the membrane and move them to the other side |
| Engulfing | surrounding the particle by folding the cell membrane around it. |
| molecule | smallest particle of a compound that is still that compound |
| atom | smallest particle of an element that is still that element |
| protein | a large molecule made up of smaller molecules called amino acids |
| lipids | fats, oils, and waxes |
| carbohydrates | sugars, starches, and cellulose |
