Exam 3 Notes

Exam 3 Notes - Tree of life bacteria, archaea, eukarya...

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Tree of life – bacteria, archaea, eukarya Protista, fungi like protists – absorb their food through membranes, heterotrophic, unicellular, decompose their food, animal like protists - eat their food, ingest, plant like – photosynthesis, they are autotrophs, make their own food Protists – all eukaryotic, mostly unicellular, differences between the protists and rest of eukaryotes are not quite as clear, not a formal kingdom anymore, organized into 3 groups: fungus like, animal like, and plant like Paraphyletic – an ancestor and only some of its descendents, Fungi protists – water molds – division Oomycota, characterized by filamentous bodies and mobile flagellated gametes, move in water, slime molds – mobile feeding stage and stationary reproductive stage with fruiting bodies that produce spores, 2 divisions : acellular slime molds – Myxomycota, multi-nucleated acellular organisms, are acellular (without cells) bc mobile stage goes through mitosis, but not cytokinesis (splitting of cells), can’t finish mitosis, like one giant cell bc of multiple nuclei, cellular slime molds – acrasiomycota, complete mitosis and cytokinesis, single celled feeding stage, aggregate (clump up) for reproduction during environmental stress, Plant like protists – (phytoplankton and algae), represent base of most aquatic food webs, lots of photosynthesis and O 2 production, primary producers, dinoflagellates – division pyrrophyta, most are marine, 2 flagella, responsible for much of the red tides, massive algae blooms, suffocates fish, filter-feeders afflicted the most, burning itching of eyes, nose, and lips in humans when exposed, diatoms – division chrysophyta, freshwater or marine, glasslike shells with holes to allow for exchange of substances, 5,600 living and 35,000 extinct species, euglenoids division euglenophyta, most freshwater, 1 to 3 flagella, mostly photosynthetic, lack a cell wall, have photoreceptor called eyespot, eyespot detects changes in light, simple plants – algae, some species of plant like protists (the seaweeds) have just been moved from kingdom plantae to protista, red algae – division rhodophyta, mostly marine, used in cosmetics and ice cream, brown algae – marine, giant kelp forests, gas bladders used to help it float, found in deep and tidal waters, green algae – division chlorophyta, marine and freshwater, ancestor to land plants, Biomagnifications – enhancement on toxins as you travel up the food web, like mercury in fish Animal like protists – protozoans, heterotrophs which actively seek and ingest good, zooflagellates/sarcodines – phylum zoomastigophora, zooflagellates – 1 flagellum, free living and symbiotic species, some parasitic, giardia – causes diarrhea, a zooflagellate causes sleeping sickness they slow the flow of blood, the white blood cells bind to the protists and form clots , sarcodines – amoebae, pseudopodia – fake feet, used to find food, foraminiferans make calcium carbonate shells, radiolarians and heliozoans – make glass-like silica shells, will
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This note was uploaded on 02/05/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Exam 3 Notes - Tree of life bacteria, archaea, eukarya...

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