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Copyright Notice! This PowerPoint slide set is copyrighted by Ross Koning and is thereby preserved for all to use from plantphys.info for as long as that.

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Presentation on theme: "Copyright Notice! This PowerPoint slide set is copyrighted by Ross Koning and is thereby preserved for all to use from plantphys.info for as long as that."— Presentation transcript:

1 Copyright Notice! This PowerPoint slide set is copyrighted by Ross Koning and is thereby preserved for all to use from plantphys.info for as long as that website is available. Images lacking photo credits are mine and, as long as you are engaged in non-profit educational missions, you have my permission to use my images and slides in your teaching. However, please notice that some of the images in these slides have an associated URL photo credit to provide you with the location of their original source within internet cyberspace. Those images may have separate copyright protection. If you are seeking permission for use of those images, you need to consult the original sources for such permission; they are NOT mine to give you permission.

2 Biology: life study of What is Life? Cellular Structure: the unit of life, one or many Growth: cell enlargement, cell number Evolution: long term adaptation Behavior: short term response to stimuli Reproduction: avoid extinction at death Metabolism: photosynthesis, respiration, fermentation, digestion, gas exchange, secretion, excretion, circulation--processing materials and energy Movement: intracellular, movement, locomotion Properties of Life

3 Homeostasis - metabolism All of these nutritional modes are found among prokaryotes! Eukaryotes are not as diverse in their nutritional modes. Nutrition ModeEnergy SourceCarbon Source PhotoautotrophLightCO 2 ChemoautotrophInorganic chemCO 2 PhotoheterotrophLightOrganic chem Chemoheterotroph Organic chem

4 Homeostasis - metabolism In eukaryotic homeostasis, we usually abbreviate the mode names because there is so little diversity… Photosynthetic = autotrophic Non-photosynthetic = heterotrophic Nutrition ModeEnergy SourceCarbon Source PhotoautotrophLightCO 2 ChemoautotrophInorganic chemCO 2 PhotoheterotrophLightOrganic chem Chemoheterotroph Organic chem

5 Eukaryotes What is special about them? How big are their cells? What type of metabolism do they have? Which electron acceptor do they use? What is special about oxygen as an electron acceptor? What do they do poorly?

6 How Many Kingdoms? Multicellular Animals MyxozoansProtozoans Tracheophytes Bryophytes True Fungi Slime Molds Red algae Brown Algae Green Algae Chrysophytes EuglenoidsArchezoans Archaea Bacteria Original Cell Extant Extinct Long Time with Prokaryotes only Protista appears

7 How Many Kingdoms? Multicellular Animals MyxozoansProtozoans Tracheophytes Bryophytes True Fungi Slime Molds Red algae Brown Algae Green Algae Chrysophytes EuglenoidsArchezoans Archaea Bacteria Original Cell Extant Extinct Long Time with Prokaryotes only Protista appears Protista refined

8 Uroid Glycogen body Vacuoles Pseudopodia Endosymbiotic bacteria Pelomyxa palustris Free-living in freshwater sediment (microaerophilic) Phagocytosis active At least 3 species of endosymbiont in each cell…two species are methanogenic archaeons! How would you describe the host cells metabolism? Accumulate glycogen reserves Fermentation Only!

9 rennes.fr/pedagogie/svt/photo/microalg/euglena.jpg Euglena gracilis Nucleus Eyespot Anterior invagination With internal short flagellum Long flagellum rooted here also (not shown) Paramylon grain Chloroplasts Protein pellicle (striations) Posterior extension Contractile vacuole Pyrenoid Mitochondrion How would you describe the metabolism? Photoautotrophic and Chemoheterotrophic!

10 Trypanosoma gambiense Blood-borne parasite member of euglenophyta Flagellated undulating cell Chemical agent causes African sleeping sickness Vectored by Tsetse fly between alternate hosts Nucleus Flagellum How would you describe the parasites metabolism? Chemoheterotrophic!

11 Pseudopodia Contractile vacuole Nucleus Food vacuoles Mitochondria Amoeba proteus A freshwater amoeboid protist Engulfing a Staurastrum green alga The pseudopodia assist in locomotion and phagocytosis, but they also secrete proteolytic enzymes to digest particles outside the cell. How would you describe the amoebas nutritional mode? Chemoheterotrophic! How would you describe Staurastrums nutritional mode? Photoautotrophic and Heteterotrophic!

12 Stentor polymorphus Funnel-shaped protist Cytostome rim is ciliated Food swept into alveolus Cilia Nucleus Holdfast Contractile vacuole Macronucleus ( N) Micronucleus (2N) How would you describe Stentors nutritional mode? Chemohetero- trophic! replication transcription

13 Cell Membrane Cilia Trichocysts Contractile Vacuoles Macronucleus Micronucleus Food Vacuoles Paramecium caudatum Oral groove not shown (on back side) A ciliated protist Mitochondrion in cytosol Paramecia can be both heterotrophic and autotrophic (at least functionally so) Paramecium bursaria endosymbiont

14 Trichocysts

15 Ectocarpus siliculosus Marine haploid filamentous thallus with true branching. Produces motile gamete by mitosis in gametangium. gametangium chloroplasts Kingdom Chromista (aka Stramenopila) erlangen.de/botanik1/photobiologie/images/kap9/a bb9-22.JPG Obviously both photoautotrophic and chemoheterotrophic! stramenopila-flagellum

16 biology/PLB117/JPEG%20files/potato.blight.j pg A water mold, Phytophthora infestans, was responsible for the potato blight that led to crop failure, starvation, and emigration of the Irish population in the 1840s. Kingdom Chromista Chemoheterotrophic only!

17 Porphyridium Cell Wall Cell Membrane Mitochondrion Nucleus Stellate Chloroplast Floridean Starch Vacuole Both chemoheterotrophic And photoautotrophic!

18 Plant Cell: mesophyll protoplast cell membrane import/export chloroplast photosynthesis cytosol fermentation glycolysis vacuole toxic waste processing nucleus transcription replication (Cell wall was digested off by cellulase) Only Photoautotrophic?

19 TEM or SEM? of a Plant or Animal Cell? glycolysis (fermentation) Krebs cycle (aka TCA cycle, citric acid cycle) electron transport system oxidative phosphorylation light reactions Aerobic Respiration Calvin cycle (aka dark reactions) Photosynthesis

20 Plant mitochondrion cristae (mesosomes) outer membrane inner membrane matrix TEM or SEM? Krebs cycle (aka TCA cycle, citric acid cycle) electron transport system oxidative phosphorylation

21 Animal Cell: Pancreatic cell endoplasmic reticulum internal transport nucleus transcription, replication mitochondrion Krebs, ETS, ox. phos. zymogen granule protein storage enzyme secretion DNA RNA 80S ribosome translation cytosol glycolysis, fermentation Chemoheterotrophic only!

22 Saccharomyces: yeast from kingdom Fungi? Cell wall: chitin not cellulose Mitosis nearly complete Cytokinesis via furrowing (budding!) ? ? Chemoheterotrophic only! Facultative: Aerobic Respiration with mitochondria Anaerobic Alcoholic Fermentation in cytosol Has more mitochondria in 3rd dimension…this is a TEM Thin slices miss components…this cell appears to lack mitochondria ! Think 3D…

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24 How Many Kingdoms? Multicellular Animals MyxozoansProtozoans Tracheophytes Bryophytes True Fungi Slime Molds Red algae Brown Algae Green Algae Chrysophytes EuglenoidsArchezoans Archaebacteria Bacteria Original Cell Extant Extinct Long Time with Prokaryotes only Protista appears Protista refined So what is this eukaryotic color code all about?


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