protists Flashcards
groupings of convenience based on?
mophology
movement
reproduction
common features of protists (not synapomorphies)
- unicellular or colonial
- small size
- rigid skeletal structures
- autagenic, allogenic - endosymbiosis
autagenic vs
allogenic - test
auto = self generated shell. cellulose, carbonate, silica
allo = another/different. not self. glue together debris. test = shell
1-ary endosymbiosis
2-ary endosymbiosis
- capture of free-living bacteria
- capture of euk cell and its endosymbiotic organelles.
cryptomonads
4 cell membranes. possess nucleus.
locomotion
sessile
sedentary
mobile
- glued to one spot
- stay in 1 place, move if necessary
- planktonic (move w.o direction). or actively
pseudopodia
lobopodia
axopodia
temporary cytoplasm-filled extensions of cell used for locomotion and prey capture.
L - blunt relatively thick extensions
a - thin, rigid rods supported by microtubules.
flagellar locomotion
push or pull.
feeding
photoautotrophic:
heterotrophic
mixotrophic
ingestion of food
phagocytosis
pinocytosis (dissolve, then injest)
2 forms of liquid in pseudopodia
ectoplasm: fairly stable
endoplasm: moves forward toward tip. becomes ectoplasm at tip
phylum diplomonadida & parabasalida
lack mt because in an anaerobic enviro.
- hypermastigotes = many flagella. endosymbionts of insects.
euglenida
unique armour called pellicle
- proteinaceous strips beneath cell membrane. use flagella or strips to move
kinetoplastida
move with flagella. attached to membrane = undulating membrane
- freeliving or parasitic.
phylum choanoflagellata
both solitary & colonial.
- collar of interconnected microvilli that surrounds a single flagellum (look like cells of sponges) colonial tendencies
