| A | B |
|---|
| Movement against a concentration gradient requiring use of energy by the cell | active transport |
| A double layer of closely packed atoms or molecules | bi-layer |
| A biological membrane that separates the interior of the cell from the outside of the cell | cell membrane |
| The structure that surrounds the cell membrane and provides support for the cell | cell wall |
| Organelle that uses light energy tomake carbohydrates from carbon dioxide and water | chloroplast |
| The amount of substance per defined space. Usually expressed as mass per unit volume | concentration |
| The interior of a cell | cytoplasm |
| Random movement of particles from an area of high concentration to the area of lower concentration | diffusion |
| State in which the concentration of a substance is equal throughout a space | equilibrium |
| Transport of substances through a cell membrane down a concentration gradient, added by carrier proteins | facilitated diffusion |
| There are power centers of the cell. They are tubular shaped organelles and convert energy into forms that are usable by the cell | mitochondria |
| A double layer of closely packed atoms or molecules | lipid bi-layer |
| A specialized part of a cell having some specific function | organelle |
| Movement of water through a selectively permeable membrane from an area of high concentration to an area of low concentration | osmosis |
| Movement of a substance without the use of energy by the cell | passive transport |
| A membrane bound sac that plays roles in intracellular digestion and the release of cellular waste products | vacuole |
