Introduction to Evolution: Origins of Life

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  • Created by: KayshaN
  • Created on: 11-10-19 10:20
How long has the Earth existed?
4.6 billion years
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Outline 3 factors of the Hadean Eon.
1) 4.6 billion years ago 2) severe volcanism, very hot 3) liquid water 4.4 billion
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Outline 5 factors of Archean Eon.
1) 4-2.5 billion years 2) oldest rocks 4 billion 3) late heavy bombardment 4.1-3.8 4) continents form 5) no free oxygen but temperature habitable
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Outline the importance of Canadian Sedimentary Rocks.
3.7-4.2 billion years, mm in size and can be compared to recent more recent and see similarities
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Outline the importance of Greenland discovered rocks.
3.8 billion, carbon containing rocks, indicating biological activity
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What is life like in Deep Sea?
no sunlight, life is weird and wonderful, organisms often eat @marine [email protected]
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What is 'marine snow'?
debri from rocks and organisms like plankton
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What zones in deep sea have x100,000 organism density? Include example of organism.
Hydrothermal Vents, e.g. Chemoautotrophic bacteria, use sulphur produce organic materials, form thick mats, food for other organisms
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Outline Theory 'How did Life Start?'
1) Monomers made by non living molecules (Abiotic synthesis) 2) monomers-->polymers 3)Self replicating molecules --> proteins 4) packaging into protobionts (very simple cells) maintain environment properties life (metabolism)
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Where did organic molecules come from? (2)
Terrestrial- synth by impact shock/energy (UV, HEAT) Extra-terrestrial- interstellar dust down on earth (LHB)
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What is LUCA?
Last Universal Common Ancestor, 3.6 billion, single celled, complete blue prints DNA rep-Protein Syn-RNA Transcription
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What happened after LUCA?
1) first photosynthetic life (cyanobacteria, blue algae) O2 in atmosphere 2) O2 evolution and diversification of animals require O2
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Other cards in this set

Card 2

Front

Outline 3 factors of the Hadean Eon.

Back

1) 4.6 billion years ago 2) severe volcanism, very hot 3) liquid water 4.4 billion

Card 3

Front

Outline 5 factors of Archean Eon.

Back

Preview of the front of card 3

Card 4

Front

Outline the importance of Canadian Sedimentary Rocks.

Back

Preview of the front of card 4

Card 5

Front

Outline the importance of Greenland discovered rocks.

Back

Preview of the front of card 5
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