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BIOA01H3 Chapter Notes -Proteobacteria, Zooplankton, Human Parasite


Department
Biological Sciences
Course Code
BIOA01H3
Professor
Ivana Stehlik

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Ch 23 Protists
23.1 Evolution of Protists Involved Endosymbiosis (Pg 498)
Evolved 1.5 to 2 billion years ago
Endosymbiosis played an important role.
o Contain mitochondria and some contain chloroplasts
o earliest eukaryotes acquired mitochondria by engulfing proteobacteria becoming
heterotrophic eukaryotes
Chroloplast endosymbiosis
o Cyanobacteria ingested by eukaryote that already had mitochondria.
o Formed symbiotic relationship
o Over evolutionary time, lost genes no longer required for independent existence and
transferred most of its genes to the host’s nuclear genome.
Gave the host cell better control of overall cell function
o Prokaryote became an organelle of an eukaryote
o Some evolved this way, other: eukaryote engulfed a photosynthetic eukaryote that
eventually became a chloroplast.

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