What phenomenon accounts for the appearance of chloroplasts in some unicellular phototrophic eukaryotes?
A) transformation of hydrogenosomes
B) secondary endosymbioses of green or red algae
C) primary endosymbioses of green or red algae
D) horizontal gene transfer

Question

Quizplus · Accepted Answer

Secondary endosymbiosis involves a eukaryotic host cell engulfing a eukaryotic algal cell, which already contains chloroplasts from a primary endosymbiosis event, leading to the presence of chloroplasts in some unicellular phototrophic eukaryotes.

What Phenomenon Accounts for the Appearance of Chloroplasts in Some