Category: Science > Biology
Asked by: katnpal1-ga
List Price: $2.00
10 Sep 2006 15:44 PDT
Expires: 10 Oct 2006 15:44 PDT
Question ID: 763968
When did the mitochondia and the chloroplast become nuclei?
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From: mikewa-ga on 11 Sep 2006 04:30 PDT
They didn't. I think you have misinterpreted something here. Are you asking about mt and cp DNA, or are you interested in the transfer of their genes to the cell's nucleus?
From: aldebaran10-ga on 19 Sep 2006 13:59 PDT
If you mean become organelles than this question is simple. The earliest cells, prokaryotes (bateria, archaea) performed their energy making tasks through glycolysis, a simple conversion of glucose to pyruvate with a relatively small ATP yield. However as evolution took its course, eukaryotes evolved and worked mostly the same way. The endosymbiotic theory states that one of these early eukaryotes consumed a prokaryote that was able to further process the products of glycolysis and produce more energy. The same is true of chloroplasts and flagellae. Evolution continued and these prokaryotes developed on their own (mitochondira have seperate DNA from the host cell) additions and the process we know as the Krebs Cycle was formed. http://www.ruf.rice.edu/~bioslabs/studies/mitochondria/mitorigin.html
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