The endosymbiotic theory proposes that mitochondria in eukaryotic cells arose from . a. endosymbiotic eukaryotes that metabolized oxygen. b. endosymbiotic eukaryotes that were photosynthetic. c. endosymbiotic prokaryotes that metabolized oxygen. d. endosymbiotic prokaryotes that were photosynthetic .

The endosymbiotic theory explains that mitochondria and chloroplasts descended from the same type of bacteria. Symbiosis is an interaction between two organisms of different species, and endosymbiosis is a type of symbiosis in which one organism lives inside the other one. According to the endosymbiotic theory, a host cell ingested symbiotic bacteria, which specialised into mitochondria. That bacteria was able to metabolize oxygen. Inside the cell, after mitochondria evolved as organelle from ingested bacteria, it kept its function to metabolize oxygen.

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.