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13 Cards in this Set

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  • Back
Heterotrophs were once classified with fungi, but they're not anymore. Why not?
This group's cell walls don't have chitin so they're not funji
the three phyla of "molds" are:
Phylum Oomycota (oomycetes)
Phylum Acrasiomycota (cellular slime molds)
Phylum Myxomycota (plasmodial slime molds)
characteristics of Oomycota: (4)
1. parasites or saprobes
2. cellulose (no chitin)
3. hyphae
4. asexual/sexual repro.
what is a saprobe?
organisms that feed on dead organic matter
What is hyphae?
filamentous structures (threadlike cells)
Phylum Oomycota has a unique reproduction cycle. How are they sexual organisms? (via what? what happens to zygote)
via gametic meiosis; zygota becomes thickwalled oospore.
How is the Phylum Oomycota asexual? (what to they make, how)
make asexual spores called mitospores by mitosis.
What are swimming mitospores called? What do they have that is unique?
zoospores. two unequal flagella pointing in opposite directions
What is the importance of Phylum Oomycota?
some cause disease of plants or fish (potato blight, downy mildew). Phytophthora is cause of Irish potato famine
Phylum Acrasiomycota has two characteristics?
1. closely related to amoebas
2. found in freshwater and on rotting vegetation
Phylum Acrasiomycota has a 4 step life cycle:
1. free living amoebas
2. lack of food, congregates into a multicellular slug
3. slug goes to light, then becomes sorocarp
4. sorocarp has sex repro. and macrocysts (2n) form and they go through zygotic meiosis
Plylum Myxomycota has 5 characteristics:
1. feeding phase is plasmodium
2. plasmodium has a cytoplasmic streaming
3. its an "organic ooze that flows around and ingests matter
4. can make diploid/haploid spores = cysts
5. sporangium forms when there's not enough food
what is a plasmodium?
a nonwalled, multinucleated mass