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| cytology | study of cells |
| cell | functional and structural unit of life |
| cell theory | theory that all living organisms are made up of microscopic units called cells and these cells perform all the functions of living things |
| unicellular organism | organism that consists of only one cell |
| multicellular organism | organism that consists of many cells |
| colonial organism | organism that consists of a group of similar cells living together. Each cell functions like a unicellular organism |
| tissue | group of many similar cells that perform a similar function |
| organ | group of tissues that perform a specific function |
| organ system | group of organs that work together to accomplish a life function |
| organelle | specialized structure within a cell that performs a specific function |
| eukaryotic cell | cell that possess both organelles and a nucleus that is surrounded by a nuclear membrane |
| prokaryotic cell | cell that lacks a nuclear membrane and has only non-membrane-bound organelles; found in kingdoms Archaebacteria and Eubacteria |
| cell membrane | the cellular membrane that forms the outermost boundary of a cell's cytoplasm and also encloses the membrane-bound organelles within a cell |
| lipid bilayer | description of two layers of phospholipids that make up the cell membrane |
| cell wall | rigid structure manufactured by a cell; located outside the cell membrane; often made of cellulose, silica, or other substances |
| cytoplasm | all the material inside the cell membrane of a cell, excluding the nucleus |
| mitochondrion | membrane-bound cellular organelle responsible for he respiration of foods to release usable energy |
| ribosome | non-membrane-bound cellular organelle associated with protein formation |
| endoplasmic reticulum | cellular structure consisting of a complex network of fine, branching tubules and interconnected folded membranes |
| Golgi apparatus | membrane-bound organelle that deals with synthesis and packaging of materials |
