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.
When itâs time to choose a doctor, you may notice that some physicians have a DO behind their name instead of an MD. The DO stands for Doctor of Osteopathic Medicine, and just like a medical doctor (or MD), they are fully trained and certified to provide exceptional health care.