Eukaryotic Cell Timeline

770 Words 4 Pages
Section Two Assignment
1. Timeline of the evolution of cells.
• 4.6 Billion years ago: The formation of Earth is believed to have transpired around 4.6 billion years ago.
• 3.5 Billion years ago: Ancient fossils from around this time period provided evidence of a bacteria-like organisms known as Prokaryotes. This ancient cell was first founded in the 1970’s in among fossilized rocks from Australia and contain no nucleus.
• 2 Billion years ago: A more complex prokaryote arises with a skeleton like structure similar to that of blue-green algae. It takes the shape of blue-green chains and is far more developed than a bacteria cell. These newly evolved prokaryotic cells have become capable of photosynthesis, which cause them to release oxygen as a waste product. Photosynthesis also allowed for cells to
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They are much larger and packed with more internal structure than the prokaryotic cell. Eukaryote cells are what made up all plants and animals.
• A few million years ago: Human have only existed for a relatively short period of time, especially compared to Earth’s 4.6 billion year age
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The Endosymbiotic Theory supports the way eukaryotic cells may have developed. Scientist believe that it began by primitive nucleated cell engulfing masses of blue-green photosynthetic prokaryotes. As same of these prokaryotes survive in the cell, they also begin to make food. The two cells begin to share cell function and become symbiotic. The larger cell provides protection for the smaller cell, while the smaller cell generates food. This is why many single celled organisms contain smaller green cells, such as chloroplasts. This theory is also supported by the fact that certain structures, such as chloroplasts, can function outside of their host cell. This implies that these organisms may have at one time lived independently from their

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