Biology 102Lecture 16Outline of Last Lecture:I. Clicker QuestionsII. BioterrorismIII. Prokaryotes UsesOutline of Current Lecture:I. ProtistsII. Animal-like ProtistsProtistsProtists obtain nutrition in many ways.- We group protists based on their mode of nutrition- Protists are eukaryotes o Membrane bound chromosomes o Can be very complexo High level of cellular complexity- Grab bag category, you never know what you’re going to get o Comprised of eukaryotes that are related to one another but don’t fit nicely into the animals, plant, or fungi category. You can think of it as the “other” category- 2 very important evolutionary advances occurred in the protists1. Evolution of the eukaryotic cell type (true nucleus)2. Evolution of multicellularityAmoeba- animal like protestEndosymbioosis- one organism lives within another Animal-like Protists1. Trichonympha- name of protist that lives in guts of termiteso Bacteria live inside trichonympha: they produce necessary enzymes2. Trichomona vaginaliso Animal like protist that causes STDs: feeds on white blood cells (male and female)o About 7 million cases per year (US) o Causes burning and itching3. Trypanosomao Causes African sleeping sickness: if you are bitten by blood sucking flyo 2 stages:1. Headache, fever, itchingBiology 1022. Insomnia at night and sleepiness during the day, confusion, coma, DEATH Transmitted by tsetse fly4. Euglenao Can be animal like or plant likeo Call it mixotroph: can switch back and forth (plant and animal)5. Ameobaso Can send out extensions of themselves and cellular contents reach out to it until extensions meet it and engulfs protistso Pseudopodia- the way they feed6. Camper’s nightmareo Giardia tropozite- most common in fresh cool running water (the kind of what you’re tempted to drink from) They attach to the inside of your intestine Cause severe diarrhea 3,000 cases per year (US) Endemic in
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