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21.1 General Biology of Protists
In the same lake where the boy was bitten, there are critical species that produce oxygen, and form the base of the aquatic food chain.
Understand that protists represent more than one evolutionary line.
Some are colonies of cells and others are multicellular.
Protists have membranous organelles that serve as the energy centers of the cell.
The theory suggests that the free living bacterium that formed a symbiotic relationship with the host cell gave rise to the mitochondria and plastids.
Mitochondria and chloroplasts were derived from the same source as the aerobic bacterium.
The life processes of the host are now complemented by the genomes of the endosymbioticbacteria.
Protists range in size from small organisms to large organisms that can reach 200 m in length.
Despite their small size, protists have a high level of complexity.
The contractile vacuole is an organelle that helps in water regulation.
Some protists are grouped according to how they acquire organic nutrition.
The photoautotrophic protists are a diverse group.
Heterotrophic protists get organic compounds from the environment.
Protists can reproduce sexually and asexually.
In protists, asexual reproduction is the norm.
The protist life cyle can survive until favorable conditions return.
cysts are formed for the transfer to a new host.
Many protists cause diseases in humans.
The foundation of the food chain in both freshwater and saltwater are aquatic photoautotrophic protists.
Protists used to be classified as a single kingdom.
Evidence shows that protists are not all from the same evolutionary line.
The plants, fungi, and animals are classified into five supergroups.
A is a high-level group below the kingdom.
The data is used to determine the relatedness of the groups.
The simplified tree does not include all of the members of the supergroup.
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