Eukaryotic Taxonomy

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53 Terms

1
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how was the eukarya phylogeny constructed

sequencing 18S rRNA

multi low sequence typing

2
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red algae

marine

multicellular mostly

also called rhodophytes

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example of unicellular red algae

galderia - acidic hot springs

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why is red algae red

phycoerythrin which is an accessory pigment

it is produced more at greater depths to help photosynthesis

5
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green algae

aka chlorophytes

closely related to plants

freshwater

endolithic algae grows inside porous rocks

6
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what kind of reproduction does green algae have

sexual and asexual

7
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what do amitochondriate eukaryotes have instead of mitochondria

mitosomes or hydrogenosome

8
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what is a mitosome

reduced mitochondria

cannot do TCA or respiratory chain

involved in maturation of iron-sulfur clusters

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what is a hydrogenosome

present when metabolism is strictly fermentative

arose from secondary endosymbiosis

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what are cysts

similar to endospores

protect cells against poor conditions

survival of starvation, desiccation, or infection

11
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characteristics of diplomonads and parabasalids

unicellular, flagellated

no chloroplast

anoxic habitats

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diplomonads

two equal nuclei

mitosomes

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parabasalids

parabasal body (support in golgi complex)

hydrogenosomes

live in intestinal tracts

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example of a diplomonad

giardia lamblia

intestinal infection

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example of parabasalid

trichomonas vaginalis

STD in humans

does not form cysts

cannot survive outside of host (hence need for sexual transmission)

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euglenozoans

unicellular, flagellated

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kinetoplastids

have a kinetoplast

live in aquatic habitats

can be disease causing

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what is a kinetoplast

a mass of DNA present in the single large mitochondrion of a kinetoplastid

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example of kinetoplastid

trypanosoma brucei

african sleeping sickness

grows in blood stream and causes CNS infection

the single membrane is enclosed in a membrane flap

20
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euglenids

nonpathenogenic, phototrophic

contain chloroplasts, but can lose it if living in the dark and will switch to become a heterotroph

feed on bacteria by phagocytosis

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alveolates

have alveoli

contains ciliates, dinoflagellates, apicomplexans

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what are alveoli

sacs under the cytoplasmic membrane that maintain osmotic balance within the cell by filling or emptying

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ciliates

have cilia for motility and food getting

macro and micronuclei

sometimes are parasites but they also live in rumen to help digestion

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what is an example of a ciliate

paramecium

during conjugation (sexual reproduction) the two paramecia exchange micronuclei

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dinoflagellates

phototrophic

can be free living or symbiotic

two flagella with different insertion points

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what are the two types of flagella in dinoflagellates

transverse flagellum: used for locomotion

longitudinal flagellum

27
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how are dinoflagellates toxic

some species secrete neurotoxins

in the right conditions, populations will bloom and form red tides

poison for humans can bioaccumulate in shellfish

28
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apicomplexans

obligate parasites

complex life cycle

contain apicoplasts

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what are apicoplasts

degenerate chloroplasts that lack pigments and phototrophic capacity but still have some anabolic pathways

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what are examples of apicomplexan diseases

malara (plasmodium)

toxoplasmosis (taxoplasma)

coccidiosis (eimeria)

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stramenopiles

flagella with many short hairlike extensions (branching)

chemoheterotrophs and phototrophic

examples: oomycetes, golden algae, diatoms, brown algae

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oomycetes

chemoheterotrophs

hyphae forming (one big cell)

cell wall is made of cellulose

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example of oomycetes

phytophthora infestans - irish potato famine

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golden algae

phototroph

golden brown colour is caused by fucoxanthin in the chloroplast

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diatoms

unicellular, phototrophic

have frustules

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what are frustules

cell walls made of silica with proteins and polysaccharides attached to it

protects the diatom against predation

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what are pseudopodia

cytoplasmic projections

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cercozoans

pseudopodia

marine

form tests (shell-like structures made from organic material)

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radiolarians

pseudopodia

marine, heterotrophic

tests are made of silica

radial symmetry

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amoebozoa

use pseudopodia for movement and feeding

(cytoplasmic streaming and phagocytosis)

gymnamoebas, entamoebas, slime molds

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gymnamoebas

free living in soil and aquatic environments

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entamoebas

parasites of vertebrates of invertebrates

entamoeba histolytica

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slime mold

production of fruiting body with spores for dispersal

can move rapidly across surfaces

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plasmodial slime mold life cycle

form a sporangium that makes haploid spores (dormant)

study slide

45
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fungi

form hyphae

hyphae produce asexual spores (conidia)

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what are the two types of hyphae

septate - separated by cell walls

coenocytic - one large cell with many nuclei

47
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symbiosis of fungi

form mycorrhizae with plant roots

help plants obtain phosphorous and the fungus obtain nutrients from the plant

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ectomycorrhizae

form a sheath around the plant root but does not penetrate it

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endomycorrhizae

the hyphae is embedded in the plant root

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bad symbiosis with fungi

can cause disease

specialized hyphae (haustoria) that enter plant cells and consume the cytoplasm

ex. mycoses - athlete’s foot

51
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types of asexual reproduction in fungi

growht and spread of hyphal filaments

asexual reproduction of spores

simple cell division (budding yeast)

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sexual reproduction in fungi

spores

fusion of two haploid cells and then meiosis to make haploid spores

spores are resistant

53
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saccharomyces cerevisiae reprodution

cell division occurs through budding

chart on slides - know for exam