BIOA01H3 Chapter Notes -Giardia Lamblia, Protist, Cytoplasmic Streaming

• School: Ryerson University
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

We don"t understand how exactly they"ve evolved but know that it involves endosymbiosis. Protists contain mitochondria and many also contain chloroplasts. Protists have membrane-bound nucleus, with multiple, linear chromosomes. In addition to cytoplasmic organelles, incl. mitochondria and chloroplasts, also have microtubules and microfilaments, providing motility and cytoskeletal support. All organisms in eukaryotic lineages consist of protists except for animals, land plants, and fungi, which arose from protist ancestors. Although some protists have characteristics resembling those of fungi, plants, or animals, several features are distinctive in only protists. In contrast to fungi, most protists are motile or have motile stages in life cycle and cell walls made of cellulose not chitin. Unlike plants, may photoautotrophic protists can also live as heterotrophs & some regularly combine both modes of nutrition. Protists don"t retain developing embryos in parental tissue nor have highly differentiated structures such as roots, stems, leaves.