Endosymbiotic Theory

Endosymbiotic Theory

Storyboard Text

  • What is the endosymbiotic theory?
  • . . . .
  • What's that?
  • . .
  • ~Endosymbiotic~ ~Theory~
  • The two major types of cells.
  • Great question! First to understand the theory, you need to understand the difference between prokaryotic cells and eukaryotic cells.
  • Bacteria CellsSingle Jobs
  • Organelles are like the organs in your body that help it function, but they are for cells
  • Prokaryotic Cells
  • DOES NOT contain membrane-bound organellesDOES NOT contain nucleus, which is the brain and holder of DNA/genes
  • What are organelles?
  • DOES contain membrane-bound organellesDOES contain nucleus, which is the brain
  • I see, prokaryotic cells are simple cells with no organs while eukaryotic cells are complex cells with organs!
  • Eukaryotic Cells
  • That's right! you are catching onto this fast.
  • Plant, Fungi, and Animal CellsMultiple Jobs
  • . . . .
  • Some organelles that are found in eukaryotic cells used to be microorganisms that were prokaryotic cells due to large prokaryotic cells engulfing the smaller prokaryotic cells.
  • ~Endosymbiotic~ ~Theory~
  • So, some organs in eukarytoic cells were prokayotic cells in the past because they were eaten by the bigger cells?
  • Now that you understand the differences between prokaryotic cells and eukaryotic cells, we can move onto the endosymbiotic theory.
  • Exactly!
  • In some eukaryotic cells, a nuclear membrane can be present but no mitochondria
  • Evidence 1
  • Prokaryotic cells don't contain mitochondiraprokaryotic calls do contains nucleoids
  • What does that mean?
  •  It shows that some eukaryotic cells have prokaryotic cell characteristics.
  • Wait, so the DNA transfered when the cell was eated?
  • Yes! The DNA in the mitochondria and cloroplasts are from them being prokaryotic cells
  • DNA in prokaryotic cells in nucleoidDNA of eukaryotic cells in nucleus
  • Evidence 2
  • Mitochondria and chloroplasts have their own DNA instead of DNA just in the nucleus
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