| Term | Definition |
| cell membrane | lipid bilayer with embedded proteins |
| cell wall | rigid outermost boundary of plant and bacteria cells |
| centriole | cylindrical arrangement of 9 sets of 3 microtubules |
| cholorplast | Double membrane boundary with stacks of inner membranes; contains chlorophyll |
| chromatin | granular form of DNA |
| chromosomes | thread like structures containing DNA |
| cytoplasm | jelly like watery substance |
| cytoskeleton | network of microfilaments |
| endoplasmic reticulum | network of membranes throughout the cell |
| golgi | sets of flattened slightly curved sacs |
| lysosomes | small circular organelles filled with enzymes |
| microfilaments | threadlike structures made of a protein called actin |
| microtubules | hollow tube-like structures made of a protein called tubulin |
| nucleus | Double outer membrane; contains DNA |
| nuclear membrane | Double membrane with pores surrounding nucleus |
| nucleolus | Dense circular region in nucleus |
| ribosomes | RNA and protein |
| vacuoles | Sac like |
| mitochondria | Enclosed by a double membrane with the inner membrane folded Have their own DNA |