BIOL108 Lecture Notes - Symbiogenesis, Nuclear Membrane, Fertilisation
15 Apr 2014
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BIOL108 Full Course Notes
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January 28, 2013 - lecture #8: origin of eukarya/protists. Mutualism ( ++: both species benefits. Competition (--: both species suffer form each other"s presence. Predation (-+: one species eats another, does kill the food item. Parasitism (-+: one species steals nutrition from another, doesn"t necessarily kill the food source. Commensalism (0+: one species is not affected by the other, whereas the other speciies benefits. Amensalism (0-: species a harms b, but species b does nothing for a. Ex: a cow crossing a stream steps on a snail. Symbiotic relationships: occur when members of two species live in close (and often obligatory) contact with each other. If one species is larger than the other, it is called the host. If it is inside the host organisms it is endosymbiotic. First euk arose billions of years after proks first appeared. Euks differ from proks in several ways: have dna in linear chromosomes in membrane bound nucleus, they have membrane-bound organelles.
