Describe what you see happening in this picture: Warm-Up Describe what you see happening in this picture:

Endosymbiosis Unit 5

Unit 5 Endosymbiosis Cells can eat other cells. This is called engulfing. One day, one bacteria cell engulfed another bacteria cell. But, it didn’t digest the bacterium because it could do photosynthesis. Video

Unit 5 Endosymbiosis Scientists think this is how the chloroplast was born. The chloroplast is where photosynthesis occurs. Therefore, the chloroplast was once a bacteria cell.

Sentence stem: If the chloroplast was bacteria it should have… Unit 5 Turn and Talk If the chloroplast is a bacteria, then what do you think we should see inside the chloroplast? Hint: think about the characteristics of bacteria. What is the evidence that the chloroplast was once a bacteria cell. Sentence stem: If the chloroplast was bacteria it should have…

Unit 5 Endosymbiosis The cell that engulfed the chloroplast also engulfed a cell that could make lots of ATP. Scientists think this is how the mitochondria was born. The mitochondria is where cellular respiration occurs. This is the endosymbiotic theory, or the theory that the chloroplast and mitochondria came from living bacteria.

Unit 5 Endosymbiosis DNA ribosomes double membrane What is the evidence of the endosymbiotic theory? In both mitochondria and chloroplast we see: DNA ribosomes double membrane

Activity Endosymbiotic Theory CER

Explain what evidence supports the endosymbiotic theory. Closure Explain what evidence supports the endosymbiotic theory. Sentence stem: The three pieces of evidence that support the endosymbiotic theory are….