Pathogens of the Human Body

Problem: Escherichia coli is a pathogen that causes urinary tract infections (among other types of infections). It is a prokaryote with a cell membrane and a cell wall. Which of the following correctly describes E. coli?

Problem: Ascaris lumbricoides is a species of helminths (worms). They infect the gut, usually in patients who have spent time in developing countries. Which of the following correctly describes Ascaris?

Problem: A certain pathogen (whose name gives away the answer) has a protein coat around an RNA genome. It infects cells in the GI tract of its host and causes nausea/vomiting. Which of the following correctly describes this pathogen?