BIO 1130 Lecture 11: Proterozoic Eon

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Phanerozoic (543 ma to present time: multicellular organisms. Proterozoic (2500-543 ma: oxygen atmosphere, single celled aerobic organisms. Archaean (3800 2500 ma: anaerobic bacterial life, oxygen starts to accumulate. Hadean (4600 3800 ma: formation of the solar system and planet, ends with origin of life. 9 triplets, central cylinder all connected to each other. Pari centriolar space: a region of cytoplasm that is assoiciated with the function of the centriole. Kinesin: carry away from the centriole. Myosin: runs along tracks of actin fibers, sticky feet, goes in any direction. **cell creeping or cell gliding not amoeboid forces: microtubules. Flagellar: 9 +2 organization of microtubules and amoeboid, one or two long tail, moves in a helicoid/circular beat (from the ends) Ciliary: 9 +2 organization of microtubules and amoeboid, 100s to 1000s short stubby, power stroke in one direction, collapsing in the other. Moves in a helicoid/circular beat (from the ends) Power stroke in one direction, collapsing in the other.