BIOL108 Lecture Notes - Lecture 9: Allopatric Speciation, Plate Tectonics, Cyanobacteria
21 Jun 2018
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BIO 108 Lec. 09 – Origin of Life
LECTURE 09 – ORIGIN OF LIFE
**do not need to memorize dates of when certain events occurred, but need to know when events
occurred relative to each other***
IMPORTANT EVENTS IN THE HISOTRY OF LIFE:
Formation of Earth Life Begins formation of prokaryotic cells oxygen in the atmosphere (due to
photosynthesis of cyanobacteria) eukaryotic cells show up colonization of land (life only used to be
in water) presence of humans
Earth’s Early Beginnings:
Fragments of rocks orbiting solar system collided
Cooling – solid rocks floated on the molten lava
Steaming gasses from the cooling rocks formed an atmosphere lacking oxygen
Temperature dropped - gasses condensed and rained down
Basins filled with water and formed transient oceans
Plate Tectonics – Continental Drift:
Understanding history of earth:
oLand-masses drift around on plates “floating” on hot mantel
oTectonic boundaries sites of earthquakes and volcanoes
oRelative locations of land masses have changes over time
Consequences of Continental Drift:
Changes to environment and climate
Opportunities for diversification of life:
oEx: when land masses are isolation, each can develop own suite of species (allopatric
speciation)
Mass Extinctions:
oEx: Antarctica drifted to pole and froze solid
The Raw Ingredients of Life:
find more resources at oneclass.com
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Document Summary
**do not need to memorize dates of when certain events occurred, but need to know when events occurred relative to each other*** Cooling solid rocks floated on the molten lava. Steaming gasses from the cooling rocks formed an atmosphere lacking oxygen. Temperature dropped - gasses condensed and rained down. Basins filled with water and formed transient oceans. Understanding history of earth: land-masses drift around on plates floating on hot mantel, tectonic boundaries sites of earthquakes and volcanoes, relative locations of land masses have changes over time. Opportunities for diversification of life: ex: when land masses are isolation, each can develop own suite of species (allopatric speciation) Mass extinctions: ex: antarctica drifted to pole and froze solid. 09 origin of life: abiotic synthesis of organic molecules, abiotic synthesis of macromolecules, formation of protocells capable of metabolism (metabolism = converting some type of fuel into energy, self-replicating molecules. Inorganic atmospheric gases + energy = organic molecules.
