1 The most prominent structure in plant cells is the large vacuole. 2  The vacuole is a large membrane-bound sac that fills up much of most plant cells. 3  The vacuole serves as a storage area, and may contain stored organic molecules as well as inorganic ions. 4  The vacuole is also used to store waste.
How long does it take to be a dentist depends on if you want to do general dentistry or become a specialist in a certain area. On average it will take eight years of school. This would be college, followed by dental school. This would be for a degree in Doctor of Dental Surgery, a D.D.S., or a Doctor of Dental Medicine, a D.M.D. A good dental school will ask for 30 to 90 credits from your undergraduate college.
How to become an Orthodontist. In order to become an orthodontist, prospective students must first become licensed to practice as a dentist. There are over 56 dental schools in the United States that are accredited by the American Dental Association (ADA). Dental schools require a minimum pre-requisite of 2 years at college prior to admission into an accredited orthodontic program. Since only 67 programs exist in the United States and Canada, admission into dental school is competitive and all applicants are required to take a Dental Admissions Test (DAT).