Chapter 28 Notes Protists

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 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 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

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

Protists Euglenoids single-celled organisms that swim using flagella Dinoflagellates -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

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

Protists