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A2.1 The Origin of Cells - Coggle Diagram

- - - - Organics Molecules (molecules that contain carbon and hydrogen)
    - - All cells come from pre-existing cells
      - All living things are made of cells
      - Cells are the basic unit of life
  - - - Enabling the formation of complex carbon compounds
      - Absence of oxygen = organic molecules formed won't be instantly broken down (oxygen is highly reactive)
- - - - Concentrations of reducing gases did not reflect the conditions of the early atmosphere
  - - - RNA can self-replicate
      - RNA can catalyse
      - Ribozymes are present in ribosomes
- - - - Seemingly ubiquitous, near-universal genetic code
    - - Existed 2.5-3.5 billion years ago
      - Lived in deep-ocean alkaline hydrothermal vents rich in hydrogen, sulphur, methane, and iron
      - Anaerobic (helpful due to the lack of oxygen)
      - Autotrophic, combining carbon with hydrogen to produce carbon dioxide and formic acid
      - Phylogenetic analysis reveals evolutionary relationships
      - Stromatolites are layered fossils, comprised of ancient microbes
  - - - Stem from LUCA