| A | B |
|---|
| organism | an independently functioning living thing |
| organ | a grouping of tissues that work together to perform a set of functions. |
| tissue | group of specialized cells that perform a particular function. |
| cell | the basic unit of structure and function in living things. |
| cell membrane | a separating barrier that controls movement of materials into and out of the cell. |
| cell wall | the outer layer of a plant cell that is made from cellulose and makes the plant cells rigid. |
| organelle | structure within a cell that performs a specific function. |
| nucleus | controls activities of the cell and contains the hereditary material |
| vacuole | an organelle that stores food, water, and other materials needed by the cell |
| ribosome | an organelle that makes proteins |
| mitochondria | organelles that produce much of the energy a cells needs to carry out its funtions. |
| lysosome | an organelle that contains enzymes that break things down to be reused by the cell |
| golgi body | an organelle that receives proteins, packages them, and distributes them |
| endoplasmic reticulum | an organelle that transports proteins inside of the cell |
| cytoskeleton | a series of protein fibers inside of a cell that give structure and shape to the cell |
| chloroplast | an organelle that converts light energy into chemical energy in the form of molecules |
| prokaryotic cell | cell that does not have a nucleus or membrane-covered organelles; bacteria are an example |
| eukaryotic ell | cell that has a nucleus and membrane-covered organelles |
| cytoplasm | a fluid mixture that contains the organelles and the compounds the cell needs. |
| osmosis | the diffusion of water across the cell membrane |
| protozoan | Any of a large group of single-celled, eukaryotic organisms, such as amoebas, ciliates, flagellates, and sporozoans. |
| metabolism | chemical processes occurring within a living cell necessary for the maintenance of life |
