Origin of Life - The Origin of Life on Earth Objectives...

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The Origin of Life on Earth Life on Earth
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Objectives Objectives D.1.1 – Describe four processes needed for the spontan- eous origin of life. D.1.2 – Outline the experiments of Miller & Urey into the origin of organic compounds. D.1.3 – State that comets may have delivered organic compounds to Earth. D.1.4 – Discuss possible locations where conditions would have allowed synthesis of organic compounds. D.1.5 – Outline two properties of RNA that would have allowed it to play a role in the origin of life. D.1.6 – State that living cells may have been preceded by protobionts, with an internal chemical en- vironment different from their
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Objectives (cont’d.) Objectives (cont’d.) D.1.7 – Outline the contribution of prokaryotes to the creation of an oxygen-rich atmosphere. D.1.8 – Discuss the endosymbiont theory for the origin of eukaryotes.
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The early Earth The early Earth Life on Earth originated between 3.5 & 4.0 billion yrs ago. Earth formed about 4.5 billion years ago , but left-over rocks bombarded the surface for the first few 100 million yrs, making it unlikely life could survive. Oldest rocks found today are 4.28 billion years old. Oldest fossils are in rocks from western Australia from 3.8 billion yrs ago - resemble bacteria, sug- gesting that life originated much earlier, possibly as early as 3.9 billion yrs ago, when Earth began to cool below 100 o C.
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Origin of life on Earth Origin of life on Earth Recall: A hypothesis is a testable explanation for 1 observation; where-as a theory is a collection of related & tested hypotheses that can support a broad range of observations. One major theory of biology attempts to explain how life began. There are three possibilities: 1) Divine creation - life was put on Earth by divine forces. This idea can’t be tested by science; it requires religious faith.
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Origin of life on Earth Origin of life on Earth How did life develop on Earth? Three possibilities: 2) Extraterrestrial origin - life was carried to Earth upon a meteorite or asteroid. We can test this idea by collecting samples from meteorites, but so far this idea is not proven. We can also search for life on other planets - SETI project.
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