Eucaryotic cells and Algal Protists

Eucaryotic cells and Algal Protists - Eucaryotic cells and...

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Eucaryotic cells and  Algal Protists   A. Eukaryotic cells descended from prokaryotic cells 1. Eukaryotes evolved from prokaryotes about 2 bya 2. The endosymbiotic theory, first proposed by Lynn  Margulis and others, suggests that double-membrane  bound organelles such as mitochondria and chloroplasts  evolved from a symbiotic relationship between a  bacterium (the endosymbiont) and a host cell a) Evidence for this includes the DNA present in both  mitochondria and chloroplasts, as well as their own  ribosomes 3. The outer membranes of these organelles originated  from invaginations of the host cell’s plasma membrane B. The endosymbiotic theory describes the origin of  chloroplasts from  photosynthetic prokaryotes and  mitochondria from aerobic bacteria 1. Molecular structure of the mitochondria and chloroplasts  support this theory 2. It is believed that incorporation of a cyanobacterium 
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This note was uploaded on 02/03/2012 for the course ECON ECON106 taught by Professor Dr.mohammadjaber during the Spring '09 term at Beirut Arab University.

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Eucaryotic cells and Algal Protists - Eucaryotic cells and...

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