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.
Last accessed 10 March 2012. Vacuoles are found in all plant and fungi cells, and some primitive animal cells, protest and bacterial cells. Vacuoles are usually smaller in an animal cell and larger in a plant cell (80% of a mature plant cell).