Protists chapter 28 notes 0809

Protists chapter 28 notes 0809 - Chapter 28 The Origins of...

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Chapter 28: The Origins of Eukaryotic Diversity Introduction of Protists 60,000 extant species known Before all eukaryotic organisms that didn’t fall into any other group Paraphyletic  Could be potentially 20 kingdoms 3 categories of protists (based on mode of nutrition) (not monophyletic groups) 1. ingestive = animal like = protozoans 2. absorptive = fungus like  3. photosynthetic = plant like = algae The Origin and Early Diversification of Eukaryotes Endomembranes System May be result of specialized infoldings of plasma membrane   Nuclear envelope, ER, Golgi Endosymbiotic Hypothesis Be sure to review this (pages 549-551 especially figure28.3) How to classify protists Figure 28.4 shows how to break protists into major clades based on molecular data Remember every book is different so we will focus on major groups and their  representative organisms.   A Sample of Protistian Diversity  (See table 28.1  on page 571) Diplomonadida and Parabasala General Characteristics Lack plastids and have unique mitochondria Diverged earliest in eukaryotic history Some once had mitochondria, but lost them early in evolution Evidenced by mitochondrial genes in their nuclear genomes 1.  Diplomonads 2 Equal sized nuclei Multiple flagella Simple cytoskeleton No plastids Example:   Giardia lamblia Cause abdominal cramps and diarrhea usually from drinking water contaminated with  human feces 2.  Parabasalids Example:   Trichomonas vaginalis Moves through mucus-coated skin by means of flagella and undulating membrane Can overcome helpful microbes in vagina Spread through sexual contact  Can occur in males but without symptoms
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Euglenozoa General Characteristics Move by means of flagella aka: flagellates 1. Euglenoids (Euglenophyta) Flagella emerge from an anterior pocket (chamber) and pull forward Paramylon = glucose polymer used for storage Live in fresh water (s0il, damp surfaces, digestive tracts) Nutrition Mostly autotrophic Some are heterotrophic Some are mixotophic (combine photosynthesis and heterotrophic) Phototaxis:  move towards light Example:  Euglena (See figure 28.8)   You should be able to label a diagram of a Euglena! 2.
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This note was uploaded on 03/28/2011 for the course BILD 1 taught by Professor Chen during the Winter '11 term at UC Riverside.

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Protists chapter 28 notes 0809 - Chapter 28 The Origins of...

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