6. How are STI's caused?STI's are caused by sexually transmitted infections which means an infection can be transmitted through sexual contact. .7. Can you use penicillin to treat diseases of the urinary and/or reproductive tract? If so, which diseases?Yes, penicillin can be used to treat diseases of the urinary and/or reproductive tract, such as gonorrhea, syphilis, and chlamydia.8. In the lab, how is the disease causing microbe determined if it considered a bacteria or a fungi?In the lab, the disease-causing microbe is determined by its appearance, whether it is spherical, rod-shaped, or spiral. Bacteria have a different shape than fungi. Bacteria are unicellular organisms, while fungi can be unicellular or multicellular. Bacteria can be treated with antibiotics, while fungi require antifungal agents. So, by their ability to survive and thrive on different media, their morphology and their staining, whether gram-positive or gram-negative, they are identified. Is this a long answer?