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.
Doctor of osteopathic medicine. A doctor of osteopathic medicine (D.O.) is a physician licensed to practice medicine, perform surgery, and prescribe medication. Like all allopathic physicians (or MDs), osteopathic physicians complete 4 years of medical school and can choose to practice in any specialty of medicine. However, osteopathic physicians receive an additional 300 to 500 hours in the study of hands-on manual medicine and the body's musculoskeletal system.