Protists
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Anti
Against
Di-
Two
Gymno-
Naked
Myco-
Tungus
Rhiz
Root
Stoma
Mouth
Troph
Nourishment
Desiccation
To dry out
Dormancy
To be temporarily inactive
Conjugate
Joined together (especially in pairs)
Characteristics of protists
Very diverse, can cause disease, eukaryotes but not Fungus, plants, or animals
Who developed endosymbiant theory?
Lynn margulis
Endosym biotic theory
Mitochondria evolved from aerobic bacteria engulfed by anaerobic eukaryote Chloroplasts evolved from aerobic photosynthetic Cyanobacteria engulfed by a non photosynthetic eukaryote
Who discovered endosymbiosis amoeba
Dr. Kwong jeong
What evidence justifies the endosymbiotic theory
DNA similarity, lack histones, ribosome and RNA similarity , replicate by binary fission
What evidence is there for endosymbiosis in the natural world?
Streptomycin inhibits bacterial ribosomes; no effect eukaryotic ribosomes, inhibits mitochondrial ribosomes
Obligate endosymbiosis
Either the endosymbiont or the host cannot survive without the other
Evidence of obligate endosymbiosis
If bacteria is removed, amoebas die
What domain is protists?
Domain eukarya
What supergroup are most protists?
Supergroup excavata
Characteristics of supergroup excavata
Excavated feeding groove or “ditch” in the body
Protists flagellum
protists have 9+2 flagellum that move side to side
Giardia intestinalis (scientific name)
Causes giardiasis “beaver fever” - animal feces in water *EXCAVATA
Who discovered giardia and how?
Anton van Leeuwenhoek Studied his sick neighbors feces and found “little animals”