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| 2722728464 | cell theory | theory that states that all organisms are made of cells, all cells are produced by other living cells, and the cell is the most basic unit of life. |  | 0 |
| 2722728465 | cytoplasm | jellylike substance inside cells that contains molecules and in some cells organelles. |  | 1 |
| 2722728741 | organelle | membrane-bound structure that is specialized to perform a distinct process within a cell. |  | 2 |
| 2722728742 | prokaryotic cell | cell that does not have a nucleus or other membrane-bound organelles. |  | 3 |
| 2722728870 | eukaryotic cell | cell that has a nucleus and other membrane-bound organelles. | | 4 |
| 2722728871 | cytoskeleton | network of proteins, such as microtubules and microfilaments, inside a eukaryotic cell that supports and shapes the cell. |  | 5 |
| 2722728972 | nucleus | organelle composed of a double membrane that acts as the storehouse for most of a cell's DNA. |  | 6 |
| 2722728973 | endoplasmic reticulum | interconnected network of thin, folded membranes that produce, process, and distribute proteins. |  | 7 |
| 2722729493 | ribosome | organelle that links amino acids together to form proteins. |  | 8 |
| 2722731128 | golgi apparatus | stack of flat, membrane-enclosed spaces containing enzymes that process, sort, and deliver proteins. |  | 9 |
| 2722731202 | vesicle | small organelle that contains and transports materials within the cytoplasm. |  | 10 |
| 2722731203 | mitochondrion | bean-shaped organelle that supplies energy to the cell and has its own ribosomes and DNA. |  | 11 |
| 2722731492 | vacuole | organelle that is used to store materials, such as water, food, or enzymes, that are needed by the cell. |  | 12 |
| 2722731544 | lysosome | organelle that contains enzymes. |  | 13 |
| 2722731545 | centriole | small cylinder-shaped organelle made of protein tubes arranged in a circle; aids mitosis. |  | 14 |
| 2722731546 | cell wall | rigid structure that gives protection, support, and shape to cells in plants, algae, fungi, and bacteria. |  | 15 |
| 2722731623 | chloroplast | organelle composed of numerous membranes that are used to convert solar energy into chemical energy; contains chlorophyll. |  | 16 |
| 2722731624 | cell membrane | double-layer of phospholipids that forms a boundary between a cell and the surrounding environment and controls the passage of materials into and out of a cell. |  | 17 |
| 2722731625 | phospholipid | molecule that forms a double-layered cell membrane; consists of a glycerol, a phosphate group, and two fatty acids. |  | 18 |
| 2722731698 | fluid mosaic model | model that describes the arrangement and movement of the molecules that make up a cell membrane. |  | 19 |
| 2722731779 | selective permeability | condition or quality of allowing some, but not all, materials to cross a barrier or membrane. |  | 20 |
| 2722731780 | receptor | protein that detects a signal molecule and performs an action in response. |  | 21 |
| 2722731830 | passive transport | movement of molecules across the cell membrane without energy input from the cell. |  | 22 |
| 2722731900 | diffusion | movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration. |  | 23 |
| 2722731901 | concentration gradient | difference in the concentration of a substance from one location to another. |  | 24 |
| 2722732248 | osmosis | diffusion of water molecules across a semipermeable membrane from an area of high water concentration to an area of low water concentration. |  | 25 |
| 2722732249 | isotonic | solution that has an equal concentration of dissolved particles compared with another solution. |  | 26 |
| 2722732281 | hypertonic | solution that has a higher concentration of dissolved particles compared with another solution. | | 27 |
| 2722732282 | hypotonic | solution that has a lower concentration of dissolved particles compared with another solution. | | 28 |
| 2722732374 | facilitated diffusion | diffusion of molecules assisted by protein channels that pierce a cell membrane. | | 29 |
| 2722732375 | active transport | energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration. |  | 30 |
| 2722732550 | endocytosis | uptake of liquids or large molecules into a cell by inward folding of the cell membrane. |  | 31 |
| 2722732551 | phagocytosis | uptake of a solid particle into a cell by engulfing the particle; see endocytosis. |  | 32 |
| 2722732644 | exocytosis | release of substances out a cell by the fusion of a vesicle with the membrane. |  | 33 |
