All cells, whether they are prokaryotic or eukaryotic, have some common features. The common features of prokaryotic and eukaryotic cells are: 1  DNA, the genetic material contained in one or more chromosomes and located in a nonmembrane bound nucleoid region in prokaryotes and a membrane-bound nucleus in eukaryotes.
Penicillin antibiotics are used to treat treat urinary tract infections, upper respiratory tract infections, lower respiratory infections, skin infections, bacterial infections, gastrointestinal infections, meningitis, and pneumonia. They work by killing the bacteria that is causing the infection.
Photo Credit Chepko/iStock/Getty Images. Penicillin is a prescription antibiotic used to treat a variety of bacterial infections. Ampicillin, amoxicillin and benzylpenicilllin are next-generation antibiotics, and are more commonly used today. When the immune system is weak and unable to fight infection, antibiotics are prescribed. You may also want to try certain supplements that have been shown to strengthen the immune system.