BIOL23

• BIOL 23: PRINCIPLES OF SYSTEMATIC BIOLOGY (LEC)
• LESSON 1: History of Earth: Origin of Life
• 2 SEMESTER-MOTERM PERIOD | AY. 2823-2004
• Big Bang


  13.8 Billion years old
• BIG BANG
• Scientists believed that there is a single point that is so dense, it exploded and expanded
• 13.8 Billion years old
• Creation of matter (elements and compounds)
• Scientists believed that there is a single point that is so dense, it exploded and expand

  1. Creation of matter (elements and compounds)

  2. The universe is still expanding faster than the speed of light
• The universe is still expanding faster than the speed of light
• Earth was formed


  4.5 Billion years old
• EARTH WAS FORMED
• 4.5 Billion years old
• Formation of our solar system
• First four planets were terrestrial and the last four were gaseous
• Formation of our solar system

  1. First four planets were terrestrial and the last four were gaseous

  2. Heavy elements settled in terrestrial planets
• Heavy elements settled in terrestrial planets
• Earliest life forms


  3.5 Billion years old
• EARLIEST LIFE FORMS
• 3.5 Billion years old
• Aristotle supported this hypothesis in his book "On the Generation of Animals in 350 B.C."
• The heat of the sun does effect generation, and so does the heat of the animals, and not only the heat of animals which operates through semen, but also any other natural residue which there may be has within it a principle of life
• Cyanobacteria


  • Photosynthetic organism and the first evidence of life
• The organisms formed were complex (maggots, scallops, etc.)
• Hadean Eon


  Greek word "Hades" meaning Hell
• Louis Pasteur (1859) provided evidences to support Biogenesis
• Evidence of carbon-12 and carbon-13
• Biogenesis


  Bio-life, Genesis-Origin or Birth
• The search of the origin of life (OOL)

  • Special Creation / Creationism
  • Panspermia
  • Theory of Spontaneous Origin
  • Abiogenesis
  • Simple Beginning
  • RNA World
  • Chilly Start
  • Deep Sea Vents
  • Community Clay
  • Electric Spark
• Biogenesis contradicts spontaneous origin generation
• Evidences of early life forms: Cyanobacteria-photosynthetic organism and the first evidence of the Hadean Eon-greek word "Hades meaning Hell
• Biogenesis


  Bio - "life", Genesis - "Origin or Birth"
• Evidence of carbon-12 and carbon-13
• Atoms and Biomolecules are non-living components
• Theories of the origin of life

  • Special Creation/Creationism
  • Panspermia
  • Theory of Spontaneous Origin
• From protocells to cells


  1. Information storage and replication

  2. Metabolism - chemical reaction in an organism

  3. Darwinian Evolution - capability to evolve and survive
• Special Creation/Creationism


  Life is created by a Supreme Being, Life is created all at once
• GEOLOGIC TIME SCALE (GTS)
• Panspermia


  Pan everywhere. Sperm "seed", The emergence of life didn't occur on Earth but rather it originated elsewhere in space or on a different celestial body and was transported on Earth, Meteorites are said to bring small life forms on Earth
• Global Boundary Stratotype Sections and Point (GSSPs)


  Maintained by International Commission on Statigraphy