The Evolutionist Theory of the Origin of Life

The Evolutionist Theory of the Origin of Life

Packet #62Chapter #26

Packet #62Chapter #26

04/20/23 01:00 1

EARTH’S EARLY ATMOSPHEREEARTH’S EARLY ATMOSPHERE

04/20/23 2

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.

04/20/23 3

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.

04/20/23 4

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.

04/20/23 01:00 5

POSSIBLE EARTH LOCATIONS HYPOTHESES FOR CHEMICAL EVOLUTION

POSSIBLE EARTH LOCATIONS HYPOTHESES FOR CHEMICAL EVOLUTION04/20/23 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

04/20/23 7

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.

04/20/23 01:00 8

FORMATION OF MACROMOLECULESFORMATION OF MACROMOLECULES

04/20/23 9

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.

04/20/23 01:00 10

Formation of the Cell from the ProtobiontFormation of the Cell from the Protobiont

04/20/23 01:00 11

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.

04/20/23 12

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.

04/20/23 13

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

04/20/23 14

The Geologic RecordTable 26.1Page 519

The Geologic RecordTable 26.1Page 519

The table shows the major eras according to the theory of evolution.

The table shows the major eras according to the theory of evolution.

04/20/23 01:00 15

Figure 26.20Figure 26.20

The look at the world during some of the “evolutionary” periods.

The look at the world during some of the “evolutionary” periods.

04/20/23 01:00 16