A number of differences exist between the structure of animal cells and plant cells. The most prominent difference is the presence of both cell walls and cell membranes in plants, while animal cells only have a cell membrane. This is a feature allowing plant cells to have a more fixed shape, while animal cells tend to be rounded. Plant cells that are able to photosynthesize have chloroplasts, while animal cells do not. They also do have a large central vacuole, plasmodesmata, and plasmids - none of which is seen in the animal cells. Plant cells store starch, while animal cells store glycogen. On the other hand, animal cells have centrioles and lysosoms, while plant cells do not. They also store cholesterol in the membrane, while plant cells do not.