Bacteria - A large group of unicellular microorganisms that lack a cell nucleus. Some bacteria are pathogenic and harmful to humans, some have no effect at all on humans, and some are beneficial.⏎
Cancer - A class of diseases in which abnormal cells divide without control and are able to invade healthy tissues in various parts of the body.⏎
Cell Membrane - A semipermeable barrier that separates the interior of a cell from the external environment.⏎
Category A Agents - A class of biological agents that the Centers for Disease Control and Prevention views as posing the highest priority risk to U.S. national security.⏎