The simplest life-forms on Earth have just one cell. An example of a one-celled life-form is a bacterium. These species of bacteria all cause diseases in humans. But many bacteria are not harmful, or even helpful.
Microbiology This reference answers the most important questions that form the foundation of Microbiology within 6 laminated pages. Carry this core material in a handy format to use beyond the course and into higher level and career courses, then even further into your working life as a refresher. With many diagrams in a small package, you will not need to crack the textbook to review.