studyquestion4 - The bacteria avoided being digested by...

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Preston Biology 22 February 29, 2008 Weekly Study Question # 4 You are an evolutionary biologist studying a phylogenetic tree. Many of these groups amaze you, some in particular include: Paramecium, a protist that makes a living by eating bacteria, and Paracoccus, a bacteria that absorbs carbon compounds and performs aerobic respiration. This reminds you of the theory that explains where mitochondria originated. Name and describe this theory. Cases similar to the one in this theory are said to still happen today: list two observations about the structure of mitochondria and chloroplast that support this theory. The theory of how mitochondria came to be is called the Endosymbiosis theory. This theory states that mitochondria were created when a bacterial cell was engulfed by a eukaryote.
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Unformatted text preview: The bacteria avoided being digested by living symbiotically within its eukaryotic host. The cell was able to do this by absorbing carbon molecules with high potential energy from the host and oxidizing them, which supplied the host with ATP. In turn, the host cell provided the bacteria with protection and carbon compounds. This relationship remained stable because of its mutual advantages. There are contemporary examples of endosymbiosis based on photosynthesis. Two observations that suggest relevance are: 1. Both mitochondria and chloroplasts have double membranes, consistent with the engulfing mechanism of origin. 2. In looking at their morphology: mitochondria and chloroplasts are about the same size of an average bacterium....
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