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DEVELOPED BY : Dr. SAROJ JAIN Ms.CHANDRABOLI GHORAI.

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Presentation on theme: "DEVELOPED BY : Dr. SAROJ JAIN Ms.CHANDRABOLI GHORAI."— Presentation transcript:

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3 DEVELOPED BY : Dr. SAROJ JAIN Ms.CHANDRABOLI GHORAI

4 After viewing this presentation, the student will be able to: Visualize history of origin of life  Describe various steps of origin of life  Understand molecular level of organization of cells i.e. how atoms constitute living cells  Correlate the phases of chemosynthetic theory with the biosynthetic processes occurring in living cells  Define chemosynthesis and coacervates

5 Scientists believe that life might have originated on earth from non-living matter through a series of chemical reactions. It all happened 3600 m.years ago in water. This theory was strongly supported by research conducted by Stanley Miller.Stanley Miller

6  Formation of simple organic compounds.simple organic compounds  Formation of major organic macromolecules.major organic macromolecules  Formation of cell-like aggregates called coacervates. coacervates.  Coacervates become more organized with use nucleic acids. Coacervates  Beginning of evolutionary development.evolutionary development  Appearance of autotrophic bacteria.autotrophic bacteria

7 Atmosphere contained methane,ammonia, hydrogen gas and water vapors but NO FREE OXYGEN. Earth was volcanically active. Oceans were a ‘primordial soup’ of ammonia, phosphate,nitrogen and carbon. Earth was exposed to UV light and radiations. There was torrential rains for many years.. CONDITIONS ON PRIMITIVE EARTH

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9 Methane CH 4

10 SIMPLE SUGARS (Monosaccharides) FATTY ACIDS AMINO ACIDS GLYCEROL

11 FORMATION O F COMPLEX ORGANIC MOLECULES Peptide Fragment

12 In the warm primordial ocean, aggregates of amino acids, proteins, and other hydrocarbons came together into a form called *coacervates*. Amino acids will spontaneously form coacervates in the same way that beads of vinegar in oil come together. A RNA DNA

13 Coacervates superficially resemble cells Lipid and protein membrane Selectively permeable Able to absorb compounds from the environment Chemical reactions may take place inside “Reproduce” by splitting when they get large

14 Cyanobacteria Photoautotrophs Archaebacteria

15 1n 1953, a University of Chicago graduate student named Stanley Miller working in Harold Urey's lab flipped a switch sending electric current through a chamber containing a combination of methane, ammonia, hydrogen and water. The experiment yielded organic compounds including amino acids, the building blocks of life, and catapulted a field of study known as exobiology into the headlines. Since that time a new understanding of the workings of RNA and DNA, have increased the scope of the subject. Moreover, the discovery of prebiotic conditions on other planets and the announcement of a bacterial fossil originating on Mars has brought new attention to the study of life's origins

16 1.When and where did life originate on earth?originate 2.Define ‘coacervates’?‘coacervates’ 3.Why is chemo synthetic origin of life not possible today?not possible 4.What is a ‘peptide bond’?peptide bond’ 5.How do dietary amino acids get transformed into proteins?transformed CAN YOU ANSWER THESE:

17 Acknowledgements NCERT Text book-XI MS ENCARTA Special thanks to Mr. V.K.Sodhi,Senior Lecturer,SCERT

18 Organisms die but life continues …. THE END


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