A large group of one-celled organisms that sometimes cause disease

The basic structural, functional, and biological unit of all known organisms

A small infectious agent that replicates only inside the living cells of an organism

Part of a classification system that divides all living things into six kingdoms

Single-celled microorganisms with structure similar to bacteria

The smallest unit that is able to perform the basic functions of life

A thin, rigid fiber made of protein that protrudes from the cell surface, used for attaching onto surfaces and other cells

A long, tail-like structure at the end of a bacterium that spins to motor it around

A structure in a cell that is enclosed by a membrane and that performs a particular function

A viral infectious disease of the upper respiratory tract that primarily affects the nose

Disorders caused by organisms — such as bacteria, viruses, fungi or parasites

A widespread occurrence of an infectious disease in a community at a particular time

Flagellum

Pili

Mitochondria

Flagellum

Nucleus

Cell membrane

Nucleoid

Cell membrane

Pili

Flagellum

Mitochondria

Nucleoid

A term used to describe an organism that is made up of a single cell

A term that means "to split" in Greek, and means that the bacteria split at birth

A substance used to stimulate the production of antiobdis and provide immunity against one or several diseases