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The Origin and Diversification of Eukaryotes Flashcards

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6187466650Mutualism/symbiosisA relationship between two species in which both species benefit0
6187468456Example of symbiosisAnimal (coral) + photosynthesizer (zooxanthellae)1
6187476867Coral bleachingThe death or expulsion of the algae that live in coral reefs and give the coral its bright color; often caused by a change in water temperature or other conditions When stressed, algae leaves the coral → coral is left bleached and vulnerable2
6187523392Domain EukaryaEuakaryotes are a monophyletic group, a sister clade to the archaea, and structurally very diverse3
6187536129Members of the domain Eukarya (see slide 8)Plants, animals, fungi and protists ("other" group)4
6187684351Unicellular protistsMicrobial eukaryotes (ex: an excavate)5
6187693660Multicellular protistsGiant kelp6
6187706428What are the advantages of a eukaryotic cell over a prokaryotic cell?Compartmentalization allows: 1. Separation of potentially harmful substances from the rest of the cell 2. Greater regulation of metabolism 3. Greater specialization of cells (including option for multicellularity)7
6187738667The evolution of eukaryotic cells include the following:The origin of a flexible cell surface, cytoskeleton, and a nuclear envelope The appearance of digestive vesicles The endosymbiotic acquisition of certain organelles8
6187803610Origin of flexible cell surfaceLoss of cell wall → cell could exchange materials with its environment rapidly enough to sustain a larger volume + more rapid metabolism Allows endocytosis Formation of ribosome-studded internal membrane → endoplasmic reticulum9
6187824158EndocytosisA process in which a cell engulfs extracellular material through an inward folding of its plasma membrane.10
6187836047Origin of a cytoskeletonGenes encoding cytoskeleton have homologs in prokaryotes Allowed larger cell to manage changes in its shape Allowed distribution of daughter chromosomes Moves materials from one part of the cell to another11
6187904672Origin of a nuclear envelopeProkaryotic DNA is attached to cell membrane Infolding of plasma membrane attached to chromosome → formation of nuclear envelope12
6187913434Appearance of digestive vesiclesAbility to *phagocytose* was crucial for endosymbiosis13
6187919554Primary endosymbiosisChloroplastsderived from direct engulfment of a cyanobacterium14
6187929477Secondary endosymbiosisEngulfment of a cell that already contains a chloroplast15
6187943372EndosymbiosisMitochondria and plastids (and peroxisomes) were derived from bacterial lineages Entire bacteria were engulfed by eukaryotes and evolved into mitochondria and plastids16
6187961567Original function of mitochondriaDetoxifying O2 produced by cyanobacteria17
6187964879CyanobacteriaPhotosynthetic, oxygen-producing bacteria (formerly known as blue-green algae).18
6187969415_________ enabled photosynthesisPlastids19
6188054884PlanktonFree-floating aquatic organisms20
6188056798Phytoplanktonphotosynthetic plankton21
6188058780AutotrophsAn organism capable of synthesizing its own food from inorganic substances using light or chemical energy. Green plants, algae, and certain bacteria are autotrophs22
6188062591HeterotrophsRequire organic compounds made by other organisms as their source of carbon23
6188076520Alveolatesa group of eukaryotes that have membrane-enclosed sacs (*alveoli*) just below their plasma membranes, composed of ciliates, dinoflagellates, and ampicomplexans24
6188085433DinoflagellatesMostly marine (ocean and freshwater); major photosynthesizers Primary producers, providing food for many species and much of the atmospheric oxygen Most have 2 flagella Major part of phytoplankton25
6188098727What protist is a parasite?Plasmodium26
6188101716PlasmodiumCausative agent of malaria Malaria: infectious disease transmitted by mosquitoes that are infected by protists; mosquitos transfer it to humans27
6188114985StramenopilesGroup of eukaryotes with tubular hairs on the longer of their two flagella Diatoms, brown algae and oomycetes belong to this group28
6188122398DiatomsDeposit silicon in their cell walls → intricate appearance *Diatomaceous earth*: soil composed off diatom skeletons Major photosynthetic producers in coastal waters and fresh waters29
6188214004Protist reproductionBoth sexual and asexual Asexual → cloneal lineages30
6188221081Dinoflagellates cause red tidesDinoflagellate blooms allow for rapid reproduction Red color is caused by pigment molecules that absorb lights Toxic to other organisms in the water (kill shellfish)31
6188230602Humans rely on remains of diatomsLiving diatoms store oil as an energy reserve and to stay afloat Dead diatoms sink to the ocean floor and become petrol + natural gas Remains are a fossil fuel32

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