Ch.28 - Protists Flashcards
Protists belong to wh domain?
Protists = euk
Radial symmetry vs bilaterians
Radial symmetry - Radial halves for infinity
Bilaterians - mirror-like symmetry that results in a distinct an tail with one plane of symmetry
T/F: Protists are paraphyletic bc ancestors are not all included
FALSE
Protists are POLYPHYLETIC bc ancestors are not all included
Ch.28 Goals
- Understand why kingdom Protista is no longer considered a legitimate taxon
- Describe process of endosymbiosis
- Name the FOUR euk super groups and an example fr ea group
- Basic understanding of alternation of generations
Ch.28 Goals
- Understand why kingdom Protista is no longer considered a legitimate taxon
- Describe process of endosymbiosis
- Name the FOUR euk super groups and an example fr ea group
- Basic understanding of alternation of generations
Describe the traditional and current classification of protists
Traditional five kingdom classification: Kingdom Protista → Polyphyletic
Current: protists are euks that are neither plants, animals, nor fungi → classified into several kingdoms
Most protists are ___ (uni/multi)-cellular
Most protists are unicellular
Some form colonies
What are mixotrophs?
Mixotrophs – combine psynth and heterotrophic nutrition
Protists are more commonly ________ (producers or consumers)
Protists are more commonly producers
- Obtain energy fr sun
- Main producers in aquatic environs
- Nutrient avail can affect concen of protists
Give examples of how protists are involved in community interactions
Parasitism: Plasmodium causes malaria, Phytophthora ramorum causes sudden oak death
Mutualism: Dinoflagellates nourish coral polyps that build reefs, Hypermastigotes digest cellulose in the gut of termites
Describe endosymbiosis
Unicellular orgs engulf other cells → become endosymbionts → ultimately organelles in host.
Mito are probably result of early euk engulfing aerobic alpha proteobacterium
Considering endosymbiotic theory, where did plants and animals diverge?
Another lineage of euk cells (e.g. green algae) acquired psynth cyanobac → evolved into plastids, wh are organelles in plants/algae that typ contain pigments for psynth.
Alternation of generations involves alternating b/w _____ (uni or multi)-cellular haploid and diploid forms.
Alternation of generations involves alternating b/w unicellular haploid and diploid forms.
- Heteromorphic generations structurally diff
- Isomorphic generations look similar
Differentiate sporophytes, zoospores, gametophytes, gametes
Sporophyte (2n) – produces haploid zoospores
Zoospores (n) – dev into male and female gametophytes
Gametophytes (n) – short branched filaments; produce gametes
Gametes (n) – come t/g in fertilization, resulting in new sporophyte
