The endosymbiotic hypothesis proposes that
A) Lysosomes fuse with endocytotic vesicles to form secondary lysosomes
B) Phagocytosis was a precursor to the gastrointestinal system
C) Secondary active transport is necessary for life
D) Mitochondria originated from engulfment of aerobic bacteria
E) The nucleus was once a separate cell

Question

Quizplus · Accepted Answer

The endosymbiotic hypothesis specifically suggests that mitochondria (and also chloroplasts in plants) originated from the engulfment of aerobic bacteria by a precursor to modern eukaryotic cells, leading to a symbiotic relationship.

The Endosymbiotic Hypothesis Proposes That