Community College of Philadelphia BIO-241 – Microbiology Lecture Assignment 4 1. Name several general characteristics that can be used to define prokaryotes. 2. Differentiate between pili and fimbrae. 3. What is the cell envelope? What is the difference between a gram (+) and gram (-)? 4. What is endospore-forming cell? 5. What is unique about prokaryotic DNA? 6. What is plasmid DNA?