Guide. A bone density test measures the density of minerals (such as calcium) in your bones using a special X-ray. This information is used to estimate the strength of your bones.
Animal cells do have vacuoles, but they are smaller, larger in number (plant cells usually have just one or a few large vacuoles) AND serve a somewhat different purpose than those of plants.
3. Plant and animals cells both contain vacuoles, but the vacuoles in plant cells are much larger than in animal cells. 4. Both plant and animal cells contain organelles called mitochondria that provide energy for the cell.However, plants also contain chloroplasts (generally in greater numbers than mitrochondria) that also produce energy for the cell, while animal cells do not.econd, the differences between eukaryotes like plant and animal cells and prokaryotes like bacteria are also important: 1. Prokaryotes generally do not contain membrane bound organelles such as mitochondria and chloroplasts, and instead produce their energy using proteins embedded in their plasma membrane.