The biological processes section of the PCAT includes 48 questions covering a range of essential concepts in biology. Here is a brief outline of what you will be tested on during this portion of the exam: General Biology Cellular and molecular biology Diversity of life forms Health Microbiology Microorganisms Infectious diseases and prevention Microbial ecology Medical microbiology Immunity Human anatomy and physiology Structures of cells, tissues, and organs Systems including circulatory, respiratory, skeletal, muscular, digestive, immune, etc.