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8 Cards in this Set
- Front
- Back
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When was the orgin of the earth?
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4600 MYA
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First Atmosphere...5
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First Atmosphere
• Hydrogen gas • Nitrogen • Carbon monoxide • Carbon dioxide • No gaseous oxygen – Enabled organic compounds to assemble |
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RNA World
• RNA: 3 things |
RNA World
• RNA: – Can self replicate. – Has enzymatic properties. – Can store information. • RNA was likely the first genetic material |
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Origin of the Plasma Membrane
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Origin of the Plasma Membrane
• Fatty acids and alcohol can spontaneously form vesicles in clay. – Proto-cells |
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The first cells..
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born 3.8 mya
Were prokaryotic and anaerobic. • No oxygen present • Relied on metabolic pathways such as fermentation, that don’t require oxygen |
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Eukaryotes Evolved from
Prokaryotes. |
Eukaryotes Evolved from
Prokaryotes • Membrane infolding – Cytomembrane system • Endosymbiosis – Mitochondria and chloroplasts |
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Theory of Endosymbiosis
.. Who created it.. who 2 organelles were created bc of it.. |
Theory of Endosymbiosis
• Lynn Margulis • Mitochondria and chloroplasts are the descendents of free-living prokaryotic organisms • Prokaryotes were engulfed by early eukaryotes and became permanent internal symbionts |
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Evidence for endosymbiosis
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Evidence for endosymbiosis
• Mitochondria & chloroplasts have own DNA • DNA of organelles circular and lack histones • Organelles reproduce by binary fission-like process • Ribosome structure like bacterial ones |
