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pumpkinbread pumpkinbread
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14 years ago
Can someone explain how mitochondria and chloroplasts supoport the endosymbiotic theory. I understand one support is they produce their own ATP. In addition, how does the Second endosymbiotic theory support the evolution of algae? Thanks for the help Slight Smile
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you are what you eat (inside biology joke)

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Educator
14 years ago
According to this theory, early eukaryotic cells engulfed aerobic bacteria in a process similar to phagocytosis in amoeba. Having been surrounded by a plasma membrane, the bacteria were not digested but, instead, entered into a symbiotic relationship with the host cell. The bacteria would have continued to perform aerobic respiration, providing excess ATP to the host eukaryotic cell, which would have continued to seek out and acquire energy-rich molecules from its surroundings. Endosymbiotic bacteria, benefiting from this chemical-rich environment, would have begun to reproduce independently within this larger cell. Subsequently, photosynthetic bacteria—such as cyanobacteria— may have become endosymbiotic in a similar way within aerobic eukaryotic cells. Such a relationship would have benefited the bacteria by providing a richer supply of carbon dioxide for photosynthesis, and the eukaryotic cells by providing excess glucose or other energy-rich products of photosynthesis.

In terms of algae, some ciliates and marine slugs are known to ingest algae and store their chloroplasts, which continue to perform photosynthesis for a few weeks. Between the outer and inner pairs are remnants of the first host cell, including a small but functioning nucleus complete with eukaryotic DNA. In this case, photosynthetic eubacteria became endosymbiotic within eukaryotic cells, which later also became endosymbiotic
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pumpkinbread Author
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#2
14 years ago
thanks so much bio...short straight to the point and simple enough to understand :-)
you are what you eat (inside biology joke)
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#3
Educator
14 years ago
Quote from: pumpkinbread (14 years ago)
thanks so much bio...short straight to the point and simple enough to understand :-)

Glad you liked it pumpkinbread, welcome to the forum!
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