Over the years, the safety of many food additives, from food dyes to trans fats, has come into question. A scare over a food additive may linger in our minds long after researchers find that there's actually no cause for alarm.
In cell biology, a mitochondrion (plural mitochondria) is an organelle found in most eukaryotic cells. Mitochondria are sometimes described as cellular power plants, because their primary function is to convert organic materials into energy. Note: The above text is excerpted from the Wikipedia article Mitochondrion, which has been released under the GNU Free Documentation License.
Mitochondria are found in all animal and plant cells. Chloroplasts, however, are found in only specific types of plant cells, such as the palisade mesophyll and spongy mesophyll cells of leaves. These cells are the ones involved in carrying out photosynthesis. Other types of plant cells, such as root cells do not contain chloroplasts.