PROTISTA/PROTOZOA Flashcards
Protist
unicellular or multicellular without specialized tissues. This simple cellular organization distinguishes them from other eukaryotes, such as fungi, animals and plants
eukaryote
membrane-bound organelles
who discovered protists. what year
Van Leeuwenhoek. 1674
who suggested placing non-plants and non-animals into protista?
Haeckel 1870.
Proto-zoa = ? Gr.
very first animal
defining characteristics of protozoa
-unicellular eukaryotes
-lacking cell walls of:
collagen
chiton
-non-photosynthetic in the primitive condition
name differences between protozoa and animalia (metazoan)
- both are eukaryotes
- protozoans are unicellular
- protozoans never develop from a blastula embryonic stage
- animals arose from a flagellated protozoan
what flagellated protozoan did animals arise from?
choanoflagellate
what size are protozoa? (hard to see)
5-250 um
how is the social/scientific impact large because of protozoa?
- major roles in primary production and in decomposition
- food
- ailments
name some ailments that are caused by protozoa
- malaria (plasmodium)
- african sleeping sickness (trypanosome)
- dysentery
- beaver fever (giardia)w
- potato famine
where do you find protozoa?
- wherever there is moisture
- in close association to other protists, other animals, or plants
- as parasites or commensals
name 3 characteristic of a protozoa
- unicellular (but functions as a complete organism. i.e.: feed, digestion, locomotion, behaving, reproducing)
- eukaryotes
- motile
how do protozoans digest?
intracellularily. digested particals become surrounded by a membrane, and expelled thru an opening in the plasma membrane
protozoa are divided into how many supergroups?
five
