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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
slide5

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

precursors to prokaryote cells

slide6

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)
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