1 / 9

The Origin of Life

The Origin of Life. Early theories Chemical evolution. http://news.nationalgeographic.com/news/2012/02/120213-first-life-land-mud-darwin-evolution-animals-science/. Early theories on the origin of life. Spontaneous generation hypothesis Life can arise from nonliving matter.

skyler-pierce
Download Presentation

The Origin of Life

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Origin of Life Early theories Chemical evolution http://news.nationalgeographic.com/news/2012/02/120213-first-life-land-mud-darwin-evolution-animals-science/

  2. Early theories on the origin of life • Spontaneous generation hypothesis Life can arise from nonliving matter. • Theory of biogenesis Life can only come from life. http://www.sciencephoto.com/media/385586/enlarge, http://www.bbc.co.uk/nature/life/Dung_beetle

  3. http://m.eb.com/assembly/156999

  4. What was early Earth like? http://www.uky.edu/KGS/education/clockstime.htm

  5. HypothesisChemical evolution in four stages Oparin & Haldane (1920s) Hypothesis Conditions on primitive Earth favored chemical reactions that synthesized organic compounds from inorganic compounds. Miller and Urey (1953) • Tested Oparin & Haldane’s hypothesis • Demonstrated that amino acids and other organic compounds may be made from inorganic compounds Stage 1: Abiotic synthesis of organic monomers

  6. http://www.flickr.com/photos/mitopencourseware/3589582386/sizes/o/in/photostream/http://www.flickr.com/photos/mitopencourseware/3589582386/sizes/o/in/photostream/

  7. Hypothesis 1Chemical evolution in four stages Fox (1958) • Produced proteinoids from clay and organic monomers • Proteinoids + cold H2O  self-assembling microspheres Stage 2: Abiotic synthesis of polymers http://www.biology.iupui.edu/biocourses/N100/ch8life.html

  8. Hypothesis 1Chemical evolution in four stages Protobionts • Aggregates of abiotically-produced molecules • Not capable of precise reproduction • Maintain internal environment different from surroundings • Exhibit metabolism and irritability Stage 3: Abiotic synthesis of protobionts http://www.doctortee.com/dsu/tiftickjian/cse-img/biology/evolution/protobionts.jpg

  9. Hypothesis 1Chemical evolution in four stages RNA • may have been the first abiotically-produced genes • Crick and Orgel (1968)hypothesized that RNA may have been life’s first information storage system • Cairns-Smith and Bernal showed that amino acids and nucleotides stick to clay Stage 4: Origin of genetic information http://www.scienceforthepublic.org/blog/wp-content/uploads/2009/09/DNA-RNA-Protein.jpg

More Related