Chapter 28

Chapter 28 - Chapter28ProtistsareEukaryotes

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Chapter 28- Protists are Eukaryotes 28.1 Most eukaryotes are single celled organisms -Most  protest are unicellular A. Structural and functional diversity in protists 1. protists have more structural and functional diversity than any other group of  eukaryotes 2. most are unicellular 3. single celled considered the simplest eukaryotes 4. their cell must function like our organs, so its more complex at the cellular level 5. more nutritionally diverse i. photoautotrophy ii. heterotrophy iii. mixotrophy 6. Varied reproduction and life cycles i. asexual ii. sexually (meosis and fertilization) iii. other variation iiii. all 3 basic types of sexual life cyles B. Endosymbiosis in Eukaryotic Evolution -created protists diversity 1. endosymbiosis-the process in which certain unicellular organisms engulf other cells,  which become endosymbions and ultimately organelles in the host cell 2. 1 st  eukaryotes acquired mitochondria by engulfing an aerobic prokaryote ( alpha   probeobacterium ). All eukaryotes have mitochondria or have signs that ancestors had  them 3. Later in eukaryotic history, one lineage of heterotrophic eukaryotes acquired an  additional endosymbiont-  photosynthetic cyantobacterium  (gram negative) that evolved  plastids, so not all protists have plastids but all show signs that they had/have a  mitochondria -these later evolved into green and red algae  4. Red and Green algae underwent SECONDARY Endosymbiosis- ingested in a food  vacuole or heterotrophic eukaryotes and became endosybionts 5. Four Membranes i. two inner from inner/outer of cyanobacteria ii. third from engulfed alga’s plasma membrane iii. fourth from heterotrophic food vacuole
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6. If it only has three….one of the four membranes were lost in the course of evolution
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This note was uploaded on 11/13/2009 for the course BIOL 1202 taught by Professor Gregg during the Fall '08 term at LSU.

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Chapter 28 - Chapter28ProtistsareEukaryotes

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