Chloroplasts are thought to have originated as endosymbiotic associations when aerobic bacteria engulfed photosynthetic cells.This relationship was favored by the production of ____ by the endosymbiont.
A) glucose
B) hydrogen ions
C) ATP
D) oxygen
E) water

Question

Chloroplasts are thought to have originated as endosymbiotic associations when aerobic bacteria engulfed photosynthetic cells.This relationship was favored by the production of ____ by the endosymbiont.  
A) glucose
B) hydrogen ions
C) ATP
D) oxygen
E) water

Quizplus · Accepted Answer

Chloroplasts are thought to have originated from endosymbiosis of aerobic bacteria and photosynthetic cells since the bacteria produced oxygen as a byproduct of photosynthesis. This oxygen production would have been favorable for the host cell and allowed for their co-evolution.

Chloroplasts Are Thought to Have Originated as Endosymbiotic Associations When