| A | B |
|---|
| cell membrane | a structure that forms the outer boundary of the cell and allows only certain materials to move into and out of the cell |
| nucleus | a structure that directs all the activities of the cell |
| chromatin | heredity material in a cell's nucleus; chromatin coils into the form of chromosomes when a cell divides |
| cytoplasm | the gel-like material inside the cell membrane and outside the nucleus |
| organelles | the structures within the cytoplasm of eukaryotic cells |
| endoplasmic reticulum | a cell organelle consisting of folded membranes that move materials around within the cell |
| ribosome | a cell organelle on which protein is made |
| Golgi body | cell organelles consisting of stacks of membrane-covered sacs that package and move proteins to the outside of the cell |
| mitochondria | cell organelles that break down food molecules and release energy |
| lysosome | a cytoplasmic organelle that contains chemicals and digests wastes and wornout cell parts |
