Origin of life
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Origin of Life. There are numerous theories as to how life began. Some of the most popular ones include: DIVINE ORIGINS The BIG BANG THEORY METEORITE PRIMORDIAL SOUP BUBBLE THEORY. BIG BANG. Universe was created by a giant explosion

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Origin of life

Origin of Life

There are numerous theories as to how life began. Some of the most popular ones include:

DIVINE ORIGINS

The BIG BANG THEORY

METEORITE

PRIMORDIAL SOUP

BUBBLE THEORY


Big bang
BIG BANG

  • Universe was created by a giant explosion

  • All matter moved out and away from central condensed ball of matter

  • Stars and planets were created

  • Universe is still expanding

  • Relates to meteor theory


Primordial soup
PRIMORDIAL SOUP

  • Most widely held theory

  • Earth’s oceans were a primordial soup full of organic matter

  • Energy from the sun, volcanoes, and lightning

    fueled chemical reactions the combined the molecules into amino acids, lipids, and other complex organic molecules


Primordial soup1
PRIMORDIAL SOUP

  • Several billion years ago Earth’s atmosphere had no free oxygen. Elements/chemicals were only in the atmosphere

  • When the earth cooled elements entered the oceans

  • Primitive oceans filled with organic chemicals were called the primordial soup

  • Since the 1950’s scientists have shown that amino acids will link together to form proteins when heated to form parts of a cell

  • Protocell=a primitive cell-like ordered structure that carried out growth, cell division, or metabolism


Biogenesis= beginning of life: protocells were formed from inorganic chemicals

precursors to prokaryote cells


  • Endo= inside or within

  • Symbiotic= relationship between living organisms

  • Eukaryotic protocells engulfed prokaryotic bacterial cells which could carry out photosynthesis and cellular respiration

  • The eukaryotic cells then contained pre-chloroplasts and pre-mitochondria which evolved into plant-like protists (ancestors of eukaryotes on earth today)


Endosymbiotic diagram
Endosymbiotic diagram


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