Lab 14 - Unicellular Eukaryotes Flashcards
Respiration, osmoregulation, and excretion
diffusion via cell membrane
fresh water passively diffuses into cell because the environment is hypotonic
Circulation for unicellular eukaryotes
no, there is cytoplasmic streaming tho
How do they digest?
engulfs their food via phagocytosis
Sensory
no nervous system, some have eyespots to detect light, temp and chemical receptors
Support
hydrostatic
pseudopodia
literally ‘false foot’, used to move and capture prey
Cilia
short, hair-like organelles that beat in wave
Flagella
long, whip-like organelles
Reproduction - Mitotic fission
Asexual - produces two identical cells
Reproduction - conjugation
Sexual - exchange of genetic material
SAR
a group - stramenopila, alveolata, rhizaria
There are three phylums in SAR
Oomycota, Apicomplexa, ciliophera
Phylum Oomycota
Water molds
distinct thalloid-bundle of hyphae
saprobes - ingest dead organic material
Phylum Apicomplexa
parasitic, example: malaria
Phylum Ciliophera
free-living
Amoebozoa
group of phylum myxomycota and phylum dictyosteliomycota
Phylum Myxomycota
true slime molds
terrestrial or soil environment
sporangium - produces haploid spores through meiosis which form either swarm cells or amoeba
Plasmodium - free-living motile foraging phase
true slime mold plasmodium
lacks cells (coenocytic)
exhibits social behaviour
Phylum Dictyosteliomycota
cellular slime mold
aquatic, terrestrial, or soil environment
heterotrophic
plasmodium - free-living motile foraging phase
sorocarp - fruiting body
Phylum Euglenozoa
group excavata
free-living
both autotrophic and heterotrophic
How do paramecium move?
cilia
Plasmodium causes what disease?
malaria
The pathogen that causes potato blight is in what phylum?
oomycota
What is the dominant stage in dictyostelium discoideum life cycle?
haploid
