Audience: Students; Grades: 6-12; Subject Areas: Science. (2001) Explains how viruses and monerans are both beneficial and harmful to humans. Describes the structure of a virus and explains how viruses reproduce and cause disease. Uses microscopic images to illustrate different types and shapes of bacteria. Includes a ten-question video quiz. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLfbXlMMms0U3YyWVk&usp=sharing