A microorganism smaller than the smallest bacterium that has no cellular structure and can cause infectious disease

An organism that harbors or nourishes another organism (the parasite)

An organism that feeds on a living host

A virus that infects bacteria

A long, hairlike structure that grows out of a cell and enables the cell to move.

A form of asexual reproduction that produces identical offspring.

Process by which a single parent reproduces by itself

A reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents

A temporary union of two organisms for the purpose of DNA transfer.

A small, rounded, thick-walled, resting cell that forms inside a bacterial cell

An organism that breaks down wastes and dead organisms

A disease that is caused by a pathogen and that can be spread from one individual to another.

A poison that can harm an organism.

A chemical that kills bacteria or slows their growth without harming body cells.

A harmless variant or derivative of a pathogen that stimulates a host's immune system to mount defenses against the pathogen