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 of allopathic medicine (M.D.) is a fully licensed medical doctor offering all the techniques and treatments of modern medicine. The method of treating disease is by the use of agents (medicines) that produce effects different from those the disease produced.