- Most protists are single celled, but there are still some that are multicellular.
- They are eukaryotes and more complex than prokaryotes.
- 2 Theories of how eukaryotic cells evolved :
- All organelles evolved from inward folds of the plasma membrane or endocytosis. ----except mitochondria and chloroplast, because they have their own DNA.
- developed by Lynn Margulis
- chloroplast and mitochondria evolved from small prokaryotes that established residenc within other, larger host prokaryotes.----the host cell may have injested theses for food and if remained alive, continued to perform respiration within cell.
- Like before, most are unicellular, but some are colonial or mulitcellular. (those two are different.)
- 4 categories of protists:
- slime molds
- unicellular algae
- Ingest food and have to live in the water, wet soil or watery enviornment inside animals.
- They have flagellates: one or more to move. Free living but some are parasitic
- Amoeboas: move by pseudopodia-extensions of cytoplasm.
- Forams: move with pseudopodia and components of limestone.
- Apicomlexans: all parasitic and named for an apparatus at their apex.
- Ciliates: use cilia to move and feed.
2. Slime molds:
- may look like fungi but not closely related.
3. Unicellular Algae:
- have chloroplast
- components of plankton-communities of organism, microscopic and drift or swim near surface of ponds and oceans.
- planktonic algae=phytoplankton
- 3 groups:
-Diatoms: glassy cells walls with silica-used to make glass.
-Green algae: mostly in freshwater lakes and ponds. Most closely related to true plants but still towards the protists. Volvox is a colony of flagellated cells.
- multicellular marine algae
- slimy rubbery substances that cushion bodies against waves
- Different colors like: green, red, brown
- Used fro food: found commonly in Asian food, soups, wraps, sushi.
- Also used for thickeners: pudding, ice cream, salad dressing, and Gel agar in petri dishes.
After notes we worked on U.P pg 27-31, whatever that was not finished was homework.
HW: pre-lab U.P pg 39-43, be prepared on Monday, know what we are doing. Nature Due 3/4
Next Scribe: Davin L.