the evolutionist theory of the origin of life packet #28 chapter #12 packet #28 chapter #12...
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The Evolutionist Theory of the Origin of Life
The Evolutionist Theory of the Origin of Life
Packet #28Chapter #12
Packet #28Chapter #12
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Earth’s Early AtmosphereEarth’s Early Atmosphere
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Early AtmosphereEarly Atmosphere
Earth’s early atmosphere, according to evolutionists, was composed of CO2, H2O vapor, CO, H2 and N2.
These gases provided the “perfect” conditions necessary for chemical evolution.
Earth’s early atmosphere, according to evolutionists, was composed of CO2, H2O vapor, CO, H2 and N2.
These gases provided the “perfect” conditions necessary for chemical evolution.
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Chemical EvolutionChemical Evolution
Chemical evolution is the formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth; The first step, according to
evolutionists, in the development of life on this planet.
Chemical evolution is the formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth; The first step, according to
evolutionists, in the development of life on this planet.
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Chemical EvolutionChemical Evolution
Scientists have developed four requirements for the chemical evolution of life.1. Little or no free oxygen2. A source of energy3. The availability of
chemical building blocks Water Minerals Gases present in the
atmosphere (All necessary to form organic molecules)
4. Time Necessary for molecules
to accumulate and react.
Scientists have developed four requirements for the chemical evolution of life.1. Little or no free oxygen2. A source of energy3. The availability of
chemical building blocks Water Minerals Gases present in the
atmosphere (All necessary to form organic molecules)
4. Time Necessary for molecules
to accumulate and react.
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Possible Earth Locations Hypotheses for Chemical Evolution
Possible Earth Locations Hypotheses for Chemical Evolution04/21/23 6
Site Hypotheses ISite Hypotheses I
There are two proposed hypotheses in regards to where the organic molecules were formed on Earth. Prebiotic soup hypothesis
The hypothesis states that the precursors of life occurred near the surface of Earth
Iron-sulfur hypothesis The hypothesis states
that organic molecules formed on or near cracks on the ocean floor
There are two proposed hypotheses in regards to where the organic molecules were formed on Earth. Prebiotic soup hypothesis
The hypothesis states that the precursors of life occurred near the surface of Earth
Iron-sulfur hypothesis The hypothesis states
that organic molecules formed on or near cracks on the ocean floor
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Miller & UreyMiller & Urey
In the 1950’s, these scientists simulated conditions on early earth…as it was believed to have been.
The scientists exposed H2, CH4, H2O and NH3 to electrical charges.
Amino acids and other organic compounds formed spontaneously.
In the 1950’s, these scientists simulated conditions on early earth…as it was believed to have been.
The scientists exposed H2, CH4, H2O and NH3 to electrical charges.
Amino acids and other organic compounds formed spontaneously.
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Formation of MacromoleculesFormation of Macromolecules
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Formation of Organic MacromoleculesFormation of Organic Macromolecules With organic
molecules in place, evolutionists believe that they were assembled together to form an organic macromolecule known as a protobiont. The hypothetical
ancestor to the cell.
With organic molecules in place, evolutionists believe that they were assembled together to form an organic macromolecule known as a protobiont. The hypothetical
ancestor to the cell.
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Formation of the Cell from the ProtobiontFormation of the Cell from the Protobiont
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Formation IFormation I
Evolutionists believe that protobionts exhibit division after growth and are able to maintain their internal chemistry but have not definitively determined how they evolved into the cell.
Evolutionists believe that protobionts exhibit division after growth and are able to maintain their internal chemistry but have not definitively determined how they evolved into the cell.
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Development of Genetic Material—The “RNA World”
Development of Genetic Material—The “RNA World” Once the cell
“evolved,” it is thought that the first genetic material to exist was RNA. Due to the presence
of ribozymes.
DNA is thought to have evolved later from RNA.
Once the cell “evolved,” it is thought that the first genetic material to exist was RNA. Due to the presence
of ribozymes.
DNA is thought to have evolved later from RNA.
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The First CellThe First Cell
The first cell, now with genetic material, is thought to have been an anaerobic heterotrophic prokaryote. Autotrophs are thought to
have developed later—along with photosynthesis.
Aerobes developed are thought to have developed later as oxygen levels increased in the atmosphere.
Eukaryotes are thought to have evolved later as a prokaryote engulfed another.
The endosymbiont
The first cell, now with genetic material, is thought to have been an anaerobic heterotrophic prokaryote. Autotrophs are thought to
have developed later—along with photosynthesis.
Aerobes developed are thought to have developed later as oxygen levels increased in the atmosphere.
Eukaryotes are thought to have evolved later as a prokaryote engulfed another.
The endosymbiont
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ReviewReview
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