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.
â¢ Animal cells do not have chloroplasts whereas plant cells have chloroplasts. â¢ An animal cell does not have a cell wall. A plant cell has a cell wall; it has cellulose wall to maintain fluid balance through osmosis. â¢ Plant cells contain one large vacuole enough to almost take up the entire cell space while animal cells contain smaller vacuoles inside the cells. â¢ An animal cell is either round or has an irregular shape.