In the endosymbiosis theory of the origin of chloroplasts, secondary endosymbiosis did not involve or result in
A) three membranes around an organelle.
B) endosymbiosis of a eukaryotic cell containing a chloroplast.
C) endosymbiosis of a prokaryotic cell containing a chloroplast.
D) a trace of the endosymbiont's nucleus in some instances.
E) generation of sugars through photosynthesis.

Question

Quizplus · Accepted Answer

Secondary endosymbiosis involves a eukaryotic cell that has already engulfed a photosynthetic prokaryote (leading to the primary endosymbiosis and the formation of chloroplasts) being engulfed by another eukaryotic cell. It does not involve the direct endosymbiosis of a prokaryotic cell.

In the Endosymbiosis Theory of the Origin of Chloroplasts, Secondary