| Term | Definition |
| cell | smallest unit of life |
| mitochondria | the organelles in which nutrients are converted to energy |
| organelle | little organ of the cell |
| cytoplasma | bath all cell organelles |
| nuclear membrane | control what enters and leaves the nucleous |
| ribosome | the organelle that synthesis proteins |
| endoplasmic reticulum | internal membrane system in cells in which lipid components of the cell membrane are assembled and some proteins are modified |
| golgi apparatus | An organelle in eukaryotic cells consisting of stacks of flat membranous sacs that modify, store, and route products of the endoplasmic reticulum |
| lysosomes | organelles that contain digestive enzymes |
| nucleus | a part of the cell containing DNA and RNA and responsible for growth and reproduction |
| centrioles | Located near the nucleus and help to organize cell division |
| cell membrane | thin, flexible barrier around a cell; regulates what enters and leaves the cell |
| cell wall | strong layer around the cell membrane in plants, algae, and some bacteria |
| Vacuole | cell organelle that stores materials such as water, salts, proteins, and carbohydrates |
| chloroplast | organelle found in cells of plants and some other organisms that captures the energy from sunlight and converts it into chemical energy |
| prokaryotes | unicellular organisms lacking a nucleus and other membrane-bound organelles; circular DNA |
| eukaryotes | DNA within nucleus; cytoskeleton; protein filaments in cell membrane; complex organelles; organelles with their own DNA |