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.
The Doctor of Osteopathic Medicine (D.O.) is a medical physician like a Doctor of Medicine (M.D.) and has a slightly different approach in terms of patient care and treatment. The DO unlike the traditional MD approaches sickness from a more holistic approach treating the patient as a whole person rather than just the parts of the person.