| A | B |
|---|
| cell wall | This exterior structure protects the cell and provides its shape. |
| cell membrane | This structure is found in all cell types and separates cells from their environments. |
| cytoplasm | This gel-like fluid fills the cell. |
| nucleus | This structure contains chromatin. |
| nucleolus | Ribosomes are produced by this structure. |
| ribosomes | These serve as sites for protein synthesis. |
| rough endoplasmic reticulum | This membrane holds ribosomes. |
| smooth endoplasmic reticulum | This is the site of lipid synthesis. |
| Golgi apparatus | This organelle performs the final processing and packaging of proteins. |
| vacuole | This organelle is used for storage. |
| lysosome | Digestion of materials within the cell takes place within this organelle. |
| chloroplast | Photosynthesis occurs in this organelle. |
| mitochondria | These organelles are involved in converting food energy into usable energy. |
| cytoskeleton | This structure provides support within the cell. |
| cilia | These hair-like projections move a cell through liquid, or move liquid over the cell. |
| flagella | This tail-like structure propels a cell through its environment. |
| vesicle | These containers transport material through the cell. |
| plasmid | These are circular structures of DNA. |
