Microbiology - Micro Organisms - Discussion

Discussion :: Micro Organisms - Section 1 (Q.No.62)


The endosymbiosis hypothesis provides an explanation for how

[A]. eukaryotes developed from prokayotes
[B]. prokaryotes developed from eukaryotes
[C]. algae developed from protozoa
[D]. protozoa developed from algae

Answer: Option A


No answer description available for this question.

Jasna said: (Nov 25, 2015)  
Symbiogenesis, or endosymbiotic theory, is an evolutionary theory that explains the origin of eukaryotic cells from prokaryotes. It states that several key organelles of eukaryotes originated as a symbiosis between separate single-celled organisms.

According to this theory, mitochondria, plastids (for example chloroplasts), and possibly other organelles representing formerly free-living bacteria (prokaryotes) were taken inside another cell as an endosymbiont around 1.5 billion years ago.

Molecular and biochemical evidence suggest that mitochondria developed from proteobacteria and chloroplasts from cyanobacteria (in particular, nitrogen-fixing filamentous cyanobacteria.

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