Origin of Eukaryotic Cells

Question 1

What was the cause of The Great Oxygenation Event?

Answer 1

Cyanobacteria producing oxygen through oxygenic photosynthesis

Question 2

What defines a modern Eukaryotic cell?

Answer 2

1. Nuclear membrane
2. Mitochondria
3. Chloroplasts (sometimes)
4. Ribosomes and DNA/RNA
5. Some genes, enzymes and pathways of bacterial origin

Question 3

What caused the formation of LECA (Last Eukaryotic Common Ancestor)?

Answer 3

Fusion of an archaeon and a bacterium

Question 4

How did organelles originate?

Answer 4

Through endosymbiosis

Question 5

Who came up with the Endosymbiont Theory?

Answer 5

Lynn Margullis (1967)