Which discovery supported the endosymbiotic theory?

Question:

Which discovery supported the endosymbiotic theory?

Endosymbiotic Theory:

The endosymbiotic theory states that organelles mitochondria and chloroplasts originated from prokaryotic cells that were ingested by the original host that somehow remained together providing benefits to each other. Over evolutionary time, this relationship became essential for the survival of both resulting in the obligatory endosymbiotic relationship that are now organelles.

Answer and Explanation: 1

The discovery of independent DNA (from the host) in mitochondria and chloroplasts supports the endosymbiotic theory. Mitochondria are able to grow and reproduce independently without needing help from the host's nucleus. Additionally, these organelles' double membranes add additional support for the endosymbiotic theory. The inner membrane would have originated from the ingested cell whereas the outer membrane would be from the host's membrane during the process of phagocytosis.


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Mitochondrion: Definition, Function & Structure

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Chapter 2 / Lesson 14
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Discover what a mitochondrion is by learning the function and definition of mitochondrion. Explore a diagram of the mitochondrion structure with explanations.


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