It is sometimes easy to forget about the vast number of microscopic organisms in the world. However, Prokaryotes and Viruses play an significant role in the world. These small organisms can harm or even kill some of the largest animals. Within this section, we will learn about the structure and physiology of prokaryotic cells, viral structure and life cycles, and define cell theory.

The contents within this section closely follow the AAMC section: Biological and Biochemical Foundations of Living Systems: Content Category 2B.