protozoan
a single-celled eukaryote that has some animal-like characteristics.
ciliates
a group of protozoans that moves by waving tiny, hair-like organisms called cilia
amoebas
a group of protozoans that move by means of psuedopods
flagellates
group of protozoans that use a whip-like organelle called a flagellum
sporozoans
a group of protozoans that do not have organelles for movement and are parasites
parasites
an organism that lives in or on a host organism and causes it harm.
bacteria
organisms that consist of a single, prokaryotic cell
photosynthetic bacteria
bacteria that produce their own food through protosynthesis
anaerobic bacteria
bacteria that do not require oxygen to survive
aerobic bacteria
bacteria that use oxygen for cellular respiration
virus
a tiny, non-living particle made up of genetic material and protein
host cell
a cell that is, or becomes, infected with a virus
immune system
a system that protects an organism from unfamiliar objects like viruses
antibodies
proteins that bind to viruses and prevent them from infecting cells.
vaccine
a preparation of virus particles that, when injected into the body, causes the immune system to produce antibodies