Endosymbiotic theory

• The endosymbiotic theory occurred through ...

  phagocytosis
• Steps of the endosymbiotic theory ...

  1. Some ancient bacteria with very fluid membranes engulfed others and maintained a symbiotic relationship with them
  2. Some of the engulfed bacteria could oxidise glucose releasing ATP - these evolved into mitochondria
  3. Some of the engulfed bacteria could use carbon dioxide and water to synthesise glucose and oxygen using energy from light - these evolved into chloroplasts
• Chloroplast structure ...

  1. Thylakoid membrane contains pigments
  2. Ribosomes
  3. Contain their own DNA
• Mitochondria structure ...

  1. Cristae are folds in the cell membrane
  2. Ribosomes
  3. Contain their own DNA