1 / 11

Origin of Life

Origin of Life. Objective 3.05 Biogenesis vs. Abiogenesis Earth’s early atmosphere & life. Biogenesis vs. Abiogenesis. Biogenesis: Theory that all living things come from other living things. Abiogenesis : Theory that living things can come from nonliving things.

fathi
Download Presentation

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. Origin of Life Objective 3.05 Biogenesis vs. Abiogenesis Earth’s early atmosphere & life

  2. Biogenesis vs. Abiogenesis • Biogenesis: Theory that all living things come from other living things. • Abiogenesis: Theory that living things can come from nonliving things. • Scientists have done several experiments to disprove this theory

  3. Louis Pasteur • Disproved abiogensis. • Experiment: Why does the broth decay? • Used S-shaped flask • Heated broth and nothing grew for 1 year (dust got trapped in the curve) • Removed S-shaped neck and broth got cloudy in 1 day (decayed) • Concluded that the microbes came from the air, NOT from the broth.

  4. Francesco Redi • Disproved abiogenesis. • Experiment: Do flies come from rotten meat? • Put meat in jars. One jar had a net covering, the other jar was open. • The open jars had maggots on the meat • The closed jars had no maggots. • Concluded that adult flies were able to lay their eggs on the meat in an open jar and could not get to the meat in the netted jar.

  5. Early Earth • Atmosphere was very different than today. • No oxygen • Thick, gassy atmosphere and hotter temperatures • Too hot for liquid water • Volcanoes

  6. About 3.8 Billion Years Ago… • The Earth began to cool • Thunderstorms drenched the Earth • Oceans formed!

  7. Oparin’s Hypothesis • Thought Heat + Gases in air = Organic Compounds (Sun) (Methane) (Amino Acids) (Lightning) (Ammonia) (Hydrogen)

  8. Miller & Urey Tested Oparin • Discovered he was right!

  9. Origin of Eukaryotic Cells • Prokaryotic Cells are simple cells without a nucleus. • Eukaryotic Cells are complex cells with a nucleus and organelles. • Endosymbiosis: theory that larger prokaryotes took in smaller prokaryotes and worked together to form a more complex cell (Eukaryotic Cell!) • Endo: Inside • Symbiosis: Work together.

  10. Mitochondria and chloroplasts have their own DNA, so that strengthens the argument that they were, at one time, prokaryotes themselves.

More Related