Chapter 29 - Chapter 29 Protists I Evolution of the...

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Chapter 29 Protists I. Evolution of the Protists A. Polyphyletic 1. Plantlike (autotrophs) 2. Heterotrophic more animal like 3. 1.5 BYA 4. Artificial Group B. Endosymbiosis – possible origin 1. Pelomyxa = ancient eukaryotic cell with symbiotic bacteria – lacks mitochondria 2. Evidence of endosymbiosis a. mitochondria similar in size to bacteria nonsulfur purple bacteria b. double membrane as if engulfed c. own circular DNA d. divide by fission Chloroplasts = similar (3x)
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II. Life at the Cellular Level A. Cell structure 1. plasma membrane a. some covered by a test CaCO 3, SiO 2 b. cell wall c. cysts = dormant stage d. pellicle – tough flexible covering 2. cytoskeleton – maintains shape (microtubules) 3. Nucleus – DNA surrounded by double membrane 4. other organelles (chapter 5) B. Homeostasis – constant internal conditions 1. small size Why? SAV ratio diffusion 2. water balance a. fresh water – contractile vacuoles active transport b. salt water – Maintain equal [ ] inside and out No water net water loss
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3. Nutrition – variable but no chemoautotrophs
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This note was uploaded on 05/10/2009 for the course BIOLOGY 21909 taught by Professor Jefffeaster during the Spring '09 term at Fullerton College.

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Chapter 29 - Chapter 29 Protists I Evolution of the...

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