Sunday, September 26, 2010

End of Protista:

Phylum Apicomplexa:
1) Sporozoans
2) Nonmotile
3) Form spores (parasites)
4) Organelles, nucleus, etc. located at anterior of cell (apical complex)
5) Reproduction: sexual, asexual and alternation of generations

Lab Example: Plasmodium (4 species of this organism cause malaria) Vector: mosquito. 40% of the world’s population live where malaria is endemic. (pg. 570, Figure 29.13)

Molds:

Phylum Acrasiomycota:
1) Cellular slime molds
2) Fresh water, damp soil, rotting vegetation
3) Related to amoebas
4) Individual organisms initially, later in life cycle individuals aggregate and form a slug (pg. 577-578, Figure 29.31)

Phylum Myxomycota:
1) Plasmodial slime- known as “true” slime molds
2) Found on forest floor (they like shade)
3) Plasmodium (a structure): a brightly colored, nonwalled, multinucleated mass of cytoplasm.
-Engulfs and digests bacteria and yeast and other small, organic matter as they move along the forest floor.
-Members form a coenocytic (multinucleated) structure known as a plasmodium.

Lab Example: Physarum (cause mustard plant disease) commonly known as devil droppings and clubroot. Have asexual spores called swarm cells, plasmogomy.

Phylum Oomycota:
1) Oomycetes
2) Fresh or saltwater, soil.
3) Water molds, white rusts, downy mildews (on grapes, lettuce, corn, cabbage)
4) Parasites and saprophytic on fish, plants, and insects.
5) 2 unequal flagella
6) Motile spores- zoospore
7) Asexual and sexual reproduction, not alternation of generations (pg 578, Figure 29.30)

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