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The Cell - general - Cell types - Eucaryotes - Endosymbiosis Hypothesis
Endosymbiosis Hypothesis
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| Description |
According to the endosymbiosis hypothesis self replicating organelles such as chloroplasts and mitochondria are the descendants of formerly free-living bacterial cells. Having been taken up by the archetypal urkaryotic host cell, they were not digested but retained as endosymbionts. (1)
This phenomenon can still be observed in nature today. The green inclusions inside the host Paramecium are symbiotic algae of the genus Chlorella. They are not incorporated freely into the cytoplasm, but are enclosed in vesicles. (2)
Their photosynthetic activity contributes to the ciliate's nutrition. (3)
Duration 00.43 min
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Sources
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Locomotion of amoeba, combined with 3D representation of chloroplast and mitochondrion. KIERMAYER, OSWALD (Salzburg). URL, WALTER GUSTAV (Wien). DIC, normal frequency.
IWF, GÖTTINGEN, C 1510
Paramecium with unicellular algae of the genus Chlorella in its cytoplasm (different magnifications). HAUSMANN, KLAUS, Berlin). DIC, normal frequency.
IWF, GÖTTINGEN, C 1810
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Abbreviations
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Order |
This film is part of the CD-ROM The Cell I - Life from Light and Air. You can order it at the IWF Knowledge and Media gGmbH.
Also available as clip.
Order no.:
C 7123
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