The Invader Within

Paper Summary:

This paper explains that eukaryotic organisms are defined by the existence of organelles within the cell format. Two of the most important of these organelles are chloroplasts and mitochondria. Both organelles serve to manufacture energy within the cell. Because of the unique structure and purpose of these organelles, several theories have arisen considering how they may have developed. The paper discusses these various theories.

From the Paper:

"The endosymbiosis theory, on the other hand, seems to stand up to further research and experimentation. This theory points to the fact that bacteria are capable of entirely encompassing other bacteria, forming symbiotic relationships with them, and maintaining them alive within their own structures. This has been shown in laboratory tests, and witnessed in nature. In one laboratory experiment, bacteria exposed to high levels of pathogenic bacteria over several hundred generations eventually adapted "their progeny became dependent on having the formerly pathogenic bacteria in food vacuoles...(Jeon, 1991)" (Armstrong) There are several ways in which bacteria may subsume other bacteria, including ingesting them and maintaining them in food vacuoles as in the Jeon experiment, or they may become infected by bacteria that are acting as parasites."

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