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8 Cards in this Set
- Front
- Back
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Compare the modern atmosphere to the past atmosphere.
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early earth was very hot and had lots of volcanoes...so hot that not much liquid water...free oxygen goas propably not prevalent
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Age of the earth/ moon/ how do we know?
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about 4.6 billion yers old...analysis of rocks
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Why was the early organic compounds called “soup”?
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ASK
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The oldest fossil remains are similar to modern ________?
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ASK
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The importance of the discoveries of these people:
Carl Woese—how did he suggests life began on Earth? Margulis—endosymbiont hypothesis Oparin and Haldane—***3 steps Miller and Urey’s experiment—you will see the picture of the apparatus Hubble’s discovery of red shift/blue shift—yellow fish, blue fish—just checking to make sure you are still with me! |
Carl Woese proposed that life bgan on Earth before teh planet was fully formed. High levels of CO2 in the atmosphere caused a strong, warming "greenhouse effect." Condiditons on Earth were similar to those that exist now on Venus....
Margulis proposed that mitochondria and plastids (such as chloroplasts) originated as free-living prokaryotes. Margulis proposes that eukaryotes originated from a symbiosis between large anaerobic prokaryotes and smaller aerobic or photosynthetic prokaryotes. think pacman... oparin and haldane proposed that life evolved by further chemical reactions and transofmrations in the complex organic soup...thought first lifeforms were heterotrophs that fed on the organic compounds in the soup...ideas supported heterotroph hypothesis |
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Heterotroph Hypothesis:
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1. THere had to be a supply of organic molecules, produced by nonbiological processes.
2. Some processes had to assemble those small molecules into polymers such as nucleic acids and proteins. 3. Other processes had to organize the polymers into a system that could replicate itself, using the organic molecules produced in Step 1 |
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Differences between prokaryotes and eukaryotes
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Prokaryote - an organism whose cells do not have membrane-enclosed nuclei or organelles; a moneran (bacterium)
Eukaryotes - an organism whose cells have a membrane-enclosed nucleus and organelles; a protist, a fungus, a plant, or an animal |
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Characteristics of living things
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1. Take in and convert materials and energy from the environment.
2. Have a high degree of chemical organization 3. Have complex structural organization that is responsible for their appearance and activities. 4. Contain coded instructions for maintaining their organization and activities. 5. Sense and react to changes in their environment 6. Grow and develop 7. Reproduce 8. Communicate |
