| A | B |
|---|
| cell membrane | thin, flexible envelope that surrounds a cell and allows passage of materials into and out of the cell |
| cell wall | outermost boundary of plant cells that is made of cellulose; found only in plant cells |
| chloroplast | cell organelle containing chlorophyll that is invovled in the process of photosynthesis; found only in plant cells |
| cytoplasm | region between the cell membrane and the nucleus |
| endoplasmic reticulum | tubular passageways in the cell through which substances such as proteins are transported |
| lysosome | small, round structure in a cell involved in the digestive activities of the cell |
| mitochondria | powerhouses of the cell in which celluar respiration occurs |
| nucleus | cell structure that directs all the activities of the cell |
| ribosome | protein-making site of the cell |
| vacuole | large, round sac in the cytoplasm of a cell that stores water, food, enzymes, and other materials |
