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Home Q & A Board Biology-Related Homework Help Cell Biology
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msitaly83 msitaly83
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14 years ago
The purple phototrophic bacteria and the cyanobacteria both generate energy by photosynthesis but differ physiologically and ecologically in the way they do it.  Which of these two photosynthetic organisms has remained more metabolically and ecologically similar to their common ancestor?  Explain the reasoning behind your answer. 
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#1
Educator
14 years ago
You can find your answer here: http://tinyurl.com/252mevp

According to endosymbiotic theory, chloroplasts in plants and eukaryotic algae have evolved from cyanobacteria via endosymbiosis. Phototrophic bacteria, however, seem more primitive; they do things similar to how primitive bacteria used to metabolize energy - that is, use anything but O2 to undergo photosynthesis.
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