Today, we turned in our Hydra/Planaria lab (and also reviewed the answers to the questions), and we got back pages 15-18 and 11-14, and the Lab #44.
We also completed pages 7-10 in our note packet, all about the protist kingdom--extra info can be found in Chapter 15, pages 311-316 in our textbook. To sum up all the information, with key points as written in our packet:
- Protists are the first eukaryotes to evolve from prokaryote (bacteria) ancestors; they are much more complex than prokaryotes.
- How did eukaryote cells, as well as their membrane-enclosed organelles, evolve?
- 2 theories of these processes:
- All organelles (except mitochondria and chloroplasts) evolved from inward folds of the plasma membrane of a prokaryotic cell.
- Endosymbiosis: Largely developed by Lynn Margulis of the University of Massachusetts:
- "Chloroplasts and Mitochondria evolved from small prokaryotes that established residence in other, larger host prokaryotes."
- Mitochondria evolved 1st
- Protists vary in structure and function more than any other group or organism
- MOST are unicellular, but some are colonial or multicellular.
- The four major categories are:
- Protozoans: They ingest food and thrive in all types of aquatic environments, including wet soil and the watery environment inside animals (parasites).
- Slime Molds: Resemble fungi in appearance and lifestyle, but are NOT closely related at all... Role=decomposers
- Unicellular Algae: Photosynthetic protists (have chloroplasts)--they support food chains in freshwater and marine ecosystems.
- Seaweeds: Large, multicellular marine algae--used for a variety of human foods (for anything from sushi wraps to ice cream!)
The homework for tonight is:
- To finish the "General Classification of Invertebrates" lab (pages 35-38)
- Prep for labs on pages 45-54
- The "Nature" assignment (due 3/2)
- And to read CH 17 if you haven't already!!!
- (It also might be a good idea to read up on pill bugs, just to get a little background knowledge for an upcoming lab)
Next Scribe: Austin