Experimental evidence suggests that the nucleoid is largely composed of DNA, about 60%, with a small amount of RNA and protein. The latter two constituents are likely to be mainly messenger RNA and the transcription factor proteins found regulating the bacterial genome.
An ophthalmologist is a medical doctor (MD) or an osteopathic doctor (DO) who specializes in eye and vision care. Ophthalmologists are trained to perform eye exams, diagnose and treat disease, prescribe medications and perform eye surgery. They also write prescriptions for eyeglasses and contact lenses.
A medical doctor (also called a physician) is a person who practices medicine to treat illness and injuries. Medical doctors go to medical school to be trained.They usually hold a college degree in medicine. Medical doctors used to make house calls to treat patients at home. Now they usually see patients in their offices or in hospitals. Medical doctors may also work for schools, companies, sports teams, or the military.edical doctors go to medical school to be trained. They usually hold a college degree in medicine. Medical doctors used to make house calls to treat patients at home. Now they usually see patients in their offices or in hospitals.