endosymbiotic theory

[arpitpatel86]

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did chloroplast and mitochondria descend from prokaryotic autotroph or was mitochondria frmo a eukaryotic heterotroph?

also earliast cells were anaerobic heterotrophs right? but the earliast organelles such as chloroplast were prokaryotic autotrophs

 

[DRHOYA]

The best evidence for this theory is the fact that the mito & chloroplast have double and multiple membranes. Also, the fact that they can produce energy, and carry their own DNA. Since chloroplasts contain photo-pigments in the thylakoid area, they could have stemmed from autotrohpic prokaryotes. Mitochondria most likely stemmed from the primitive heterotrophic prokaryotes due to the fact that they contain novel metabolic pathways such as the krebs cycle enzymes and the ETC. Hope this helps.

 

[bumpski20]

1) mito descended from prokaryote, which explains the extreme similarities between mitochondria and bacterial cells (own single circular dna, replicates by binary fission, own ribosomes which sythnethisize some proteins, similar sizes, etc).

2) yes, earliest cells were anaerobic heterotrophs. i dont no about about the earliest organelles.