Topic 10 - Protists Flashcards
Characteristics of protists…
- single-celled (mostly)
- various means of locomotion (flagella, pseudopods, cilia)
- nutrition (ingestion of particles/prey, absorption of nutrients, photosynthesis)
- repro. (sexual & asexual)
- polyphyletic
Taxonomic groups…
Excavates Euglenozoans Stramenopiles Alveolates Rhizarians Amoebozoans Red algae Green algae
A bit about Excavates…
flagellate protozoans Diplomonads - single celled (2 nuclei) - Giardia -> gastro Parabasalids - endosymbionts (assist insects with digestion of cellulose) - may cause disease
A bit about Euglozoans…
Euglenoids (some heterotrophs, some photosynthetic)
Kinetoplastids (insect vectors spread disease)
A bit about stramenopiles…
variable nutrition modes (some heterotrophs, some photosynthetic)
variable celluarity (multi- & unicellular)
3 major groups -
water moulds - decomposers
diatoms - photosynthetic
brown algae (seaweed) - photosynthetic
A bit about Alveolates…
variable nutrition modes
- photosynthetic (dinoflagellates)
- parasitic (apicoplexans) -> cause many human & animal diseases!
- predators/particle feeders (ciliates) eg. paramecium (the prac one!)
Infection via alveolates similar - multi hosts, spread via spores in food, water insect bites, those with shite immunity most at risk
A bit about malaria…
tropical
causal agent Plasmodium spp.
life cycle between mozzies & humans
check out cycle page 25 & 26 - easy to remeber! : )
A bit about toxoplasmosis…
main reservoir - cat
many intermediate hosts…dogs, rats, rabbits…
check cycle on slide 28 - easy peasy!
transmitted by undercooked meat, cat poo, transfusions
A bit about amoebozoans…
amoebas - aquatic, predatory/parasitic
slime moulds - acellular/cellular, decomposers, have feeding stage & reproductive stage
When food scarce - fruiting bodies formed & spores disperced to feed
A bit about red algae…
multicellular
photosynthetic
red pigments
source of agar
A bit about green algae…
uni- or multicellular
photosynthetic
close relative to plants
