Week 3 BIOB 170 Notes
Week 3 BIOB 170 Notes BIOB 170
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This 2 page Class Notes was uploaded by Isabella Sturgeon on Saturday February 27, 2016. The Class Notes belongs to BIOB 170 at University of Montana taught by Dr. Kevin Murray in Spring 2016. Since its upload, it has received 15 views. For similar materials see Principles Biological Diversity in Biology at University of Montana.
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Date Created: 02/27/16
Week 3 BIOB 170 Notes Eukarya • First fossil is 2.1 billion years old • Homologous proteins with prokaryotes • Diverse • Created secondary endosymbiotic theory 5 Super groups • Formerly known as kingdom Protista • Derived via secondary endosymbiosis o Green and red algae were engulfed by other cells o 9 former protists were derived this way • 1. Excavata o Has a concaved region of their cell o Unicellular o Reduced mitochondria o Most archaic o Uncertain phylogenetic status o 3 groups 1. Diplimonadida • 2 nuclei • Reduced mitochondria called mitosomes which have no folding • Anaerobic • Ex. Giardia 2. Parabasala • Parasitic, mutualistic • Reduced mitochondria • Flagellate undulating membrane • Ex. Trichomonas (STD) 3. Eugelenozoa • Metabolically diverse • Parasitic or free- living • Hetero/ autotrophic • Crystalline rod in flagella o 2 subphyla § Kinetoplastids • Hetero, parasitic/ free-living • Kinetoplasts in mitochondria § Euglenids • Autotrophic or mixotrophic • Secondary endosymbiosis derived • 2 unequal flagella • Pellicle under plasma membrane- contract for movement • Phototactic- responsive to light • Contractile vacuole- contracts and holds water, maintain water balance • Eye spot: allows to find the most beneficial spot with the best light • 2. Chromalveolata o 2 clades o Derived via secondary endosymbiosis o Most are photosynthetic (except apicomplexans, cillates) o 1. Alveolates • Auto/ hetero/ mixotrophic • Membrane bound alveoli • 3 phyla o Dinoflagellates § Auto/heterotrophic § Primary O2 producer § 2 most important marine O2 producer § Chromosomes remain condensed through cell cycle § Have theca (cellulose) plates § 2 lateral flagella § Red Tide • Secretes a neurotoxin: saxitoxin • Invertebrates accumulate high levels • Results in paralytic shellfish poisoning § Pfiesteria- paralyze and eat § 3 forms • 1. Flagellate o Produces toxin (numbness and paralysis) • 2. Amoeboid- crawling o Secretes digestive enzymes • 3. Amoeboid cyst- rest phase until more prey § Several genus are bioluminescent
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