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Conversations with the Earth: Forming Life on Earth

Join Tom Burbinet from Framingham University as he discusses the basic definition of life, including growth, metabolism, motion, reproduction, and stimulus response. Learn about organic compounds, amino acids, proteins, nucleic acids, and the Oparin-Haldane Hypothesis. Explore the Miller-Urey experiment and the role of DNA in storing genetic information. Watch the video to dive deeper into the origins of life on Earth.

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Conversations with the Earth: Forming Life on Earth

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  1. Conversations with the EarthTom Burbinetburbine@framingham.edu

  2. Quiz on Thursday • Forming life on Earth

  3. http://video.google.com/videoplay?docid=-5878733356144169008#http://video.google.com/videoplay?docid=-5878733356144169008#

  4. Basic Definition of Life • Growth • Metabolism • Motion • Reproduction • Stimulus response

  5. organic compound - one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.

  6. Amino acids – building blocks of proteins

  7. Essential – can’t be synthesized by humans Nonessential - can be synthesized by humans

  8. polypeptide - single linear chain of amino acids • proteins –chains of amino acids

  9. Three major macromolecules are essential for all known forms of life. • Proteins • Nucleic acids – carry genetic information • RNA – Ribonucleic acid • DNA - Deoxyribonucleic acid

  10. Oparin-Haldane Hypothesis (1920s) • Aleksandr Oparin and John Haldane independently came up with the idea that life could have originated from chemical reactions in a hydrogen-rich atmosphere

  11. If the early atmosphere was rich in hydrogen-containing gases such as methane (CH4) and ammonia (NH3), sunlight or lightning could cause organic compounds to form

  12. Miller-Urey experiment (1952) • Tested whether organic compounds could be produced from inorganic precursors

  13. Experiment formed organic compounds • Experiment formed amino acids

  14. http://academicearth.org/lectures/dna-introduction

  15. human and mouse genomes have some 3 billion DNA base pairs

  16. RNA –transfers genetic information and makes proteins and other compounds • DNA – stores genetic information

  17. DNA

  18. DNA • James Watson and Francis Crick discovered that DNA had a double helix structure • DNA contains the genetic information that allows all modern living things to function, grow and reproduce.

  19. http://www.youtube.com/watch?v=sf0YXnAFBs8

  20. Any Questions?

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