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Protists
Protists exhibit more structural and functional diversity than any other group of organisms.- all are eukaryotic- most are unicellular, but some are colonial or multicellular
Protists
Protists are divided into 3 categories:
- Animal-like are heterotrophs which consume other organisms.
- Plant-like make their own food through photosynthesis just as plants do.
- Fungus-like acquire their nutrients by decomposing dead organisms.
Protists
The large diversity in protists is a result of endosymbiosis- early eukaryotes were the result of acquiring mitochondria- a second acquiring of photosynthetic cyanobacteria which evolved into a plastid; led to photosynthetic algae
Protists
Protists can move in different ways: - by using a tail-like structure
called a flagella - through the use of cilia, which
are short, hair-like structures that cover the cell surface
- by using a fake foot, or pseudopod
Protists
Animal-like protists are often referred to as protozoa. - some animal-like protists are parasitic and cause diseases such as malaria and African sleeping sickness.
Protists
Plantlike protists -can be one-cell or multicellular - can live in soil, on trees, and in both fresh water and salt water. - do not have roots, stems, leaves
Protists
Euglenoids- single-celled organisms that swim
using flagellaDinoflagellates -single-celled protists that are
primarily marine plankton
Protists
Diatoms-single-celled algae that releases into
the environment approximately half of the oxygen that we breathe.
Algae- green algae are multicellular, and
contain chlorophyll, but they are not considered plants because they don’t have roots, stems, or leaves.
Protists
Funguslike Protists- Oomycetes- have hyphae but cell walls are made of cellulose, not chitin- usually have flagella - do not carry out photosynthesis; instead are parasites or decomposers