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Endosymbiotic Theory

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Upon the discovery of an unknown microscopic organism, many thought provoking questions were formed in the mind of scientists. After further investigation, the scientists were able to conclude that the unknown organism is unicellular and is a eukaryote. Unicellular eukaryotes are an extremely interesting type of species with many of their own characteristics. Organelles, membrane-enclosed structures with specialized functions that are suspended in the cytosol of eukaryotic cells, are specifically designed to assist in the survival of the cell. For example, the nucleus, ribosomes, endoplasmic reticulum (ER), and Golgi apparatus are all specific organelles that should be present in a eukaryotic cell. The nucleus, which contains most of the genes in the eukaryotic cell, consists of the nuclear envelope, the nucleolus, and chromatin. Each of these three parts of nucleus plays an important role in the cell. The nuclear envelope separates the nucleus from the …show more content…
These similarities led to what is known today as the endosymbiotic theory. The endosymbiotic theory states that some organelles, such as mitochondria and chloroplasts, evolved through symbiotic relationships. Over the years, there have been many discoveries made to support this theory. The strongest evidence to date that has been found to support this theory is mitochondria and chloroplasts contain their own DNA. This could suggest that at one point in time, they lived on their own as prokaryotes. Furthermore, since mitochondria and chloroplasts both contain small amounts of genetic information, they must have been free living organisms at one point. In addition, they are capable of synthesizing their own proteins, which is something all organisms can do. As a result of these observations and many more that were made throughout time, scientists were able to provide much support for the endosymbiotic

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