| A | B |
|---|
| cell | the smallest functional unit of life |
| unicellular organisms | living things made of only one cell. Most numerous life form. |
| multicellular organisms | living things made fo 2 or more cells |
| Robert Hooke | first to see cells under a microscope |
| Anton von Leeuwenhoek | first to see living cells under a mircoscope |
| 3 parts of cell theory | all living things composed of one or more cells; basic units of structure and function; come only from existing cells |
| biogenesis | the beginning of life |
| founders of cell theory | Matt Schleiden, Theodore Schwann, Rudolph Virchow |
| cell diversity | cells come in many shapes and sizes |
| organelle | performs specific functions in the cell |
| eukaryotes | true cells containing a nucleus and membrane-bound organelles |
| prodaryotes | cells that lack a nucleus and membrane-bound organells, such as bacteria and viruses |
| 3 main parts of eukaryotic cell | cell membrane, cytoplasm, nucleus |
| cell membrane | outer boundary of the cell |
| cytoplasm | inside of the cell surrounding the organelles |
| nucleus | directs all cell activity |
| chromotin | DNA in its active form |
| cell membrane | separates the cell from its environment |
| cell membrane | gives cell shape and flexibility |
| cell membrane | selectively permeable |
| cell membrane | made of 2 layers of lipids and proteins |
| cell membrane | fats here prevent cell from dissolving in water |
| cytoplasm | jellylike material containing salt, water, organic material |
| ribosomes | site of protein synthesis, made of RNA and proteins |
| endoplasmic reticulum | membrane of folded sacs and tunnels |
| rough endoplasmic reticulum | full of ribosomes, proteins produced |
| smooth endoplasmic reticulum | no ribosomes, stores proteins |
| golgi apparatus | production line of cells, correct proteins |
| mitochondria | powerhouse of the cell |
| lysosomes | contain digestive enzymes |
| microtubules | protein tubes that shape & support cells |
| spindle fibers | specialized microtubules that aid in mitosis |
| microfilaments | thin threads of protein |
| cytoskeleton | skeleton of the cell, made of microfilaments |
| cilia | short, hairlike extensions on outside of cells |
| flagella | whiplike extenstions on outside of cells |
| nucleus | control center of cell |
| cell wall | supports & protects plant cells |
