If a chloroplast in a protist has four membranes, it arose from ____.
A)primary endosymbiosis
B)secondary endosymbiosis
C)tertiary endosymbiosis
D)protist cell fusion
E)protist organelle replication

Question

Quizplus · Accepted Answer

The presence of four membranes in a chloroplast indicates that it was derived from secondary endosymbiosis, in which the engulfed plastid (from an earlier endosymbiosis event) becomes surrounded by a second membrane when it is engulfed by a heterotrophic eukaryotic host. The resulting organelle then gains additional membranes if it is engulfed by another host in a tertiary endosymbiosis event.

If a Chloroplast in a Protist Has Four Membranes, It