Endosymbiotic Theory Pt 2
Storyboard Text
- Well, scientists have determined that the ancestral bacteria for mitochondria was the first to be eaten by a larger bacterial cell.
- Lets goo! I'm not dead and I get a free house.
- However, instead of being digested, the bacteria instead lived inside of the larger bacteria and over time, evolved into the mitochondria we are familiar with today..
- *Gulp*
- That snack hit the spot, but I'm still hungry...
- In addition, some of the larger cells ate not only the ATP bacteria, but the sunlight absorbing bacteria as well which evolved into the chloroplasts found in plant cells.
- So, they become forced roommates living and evolving in the same body? That sounds like a certain symbiote.
- Yes, there is a ton of evidence such as the mitochondria and chloroplasts having their own separate DNA from the nucleus of cells, just like bacteria in the past.
- In addition, the way that the mitochondria and chloroplasts multiply today is quite similar to the reproduction of bacteria.
- Plus, the mitochondria and chloroplasts are approximately the same size as bacteria which is a clear sign that they were once related.
- On a side note, Mitochondria have their own cell membrane, just like bacteria do.
- But is there any evidence to support this theory?
- Well, I can tell you that it certainly wasn't overnight.
- But, that's a subject for another time.
- Endosymbiosis is just an example in the theory of evolution which states that small changes in living creatures(like the organelle bacteria) occur over long periods of time to help them adapt to their environment.
- How long did this leap from bacteria to organelles even take?
- Good call professor know it all.
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