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 doctor is someone who maintains or restores human health through the practice of medicine. He or she will diagnose and treat human disease, ailments, injuries, pain or other conditions. A doctor can be found in several settings, including public health organizations, teaching facilities, private practices, group practices and hospitals.