What phenomenon accounts for the appearance of chloroplasts in some unicellular phototrophic eukaryotes?
A) endosymbiosis
B) secondary endosymbiosis
C) sequencing of chloroplasts' SSU genes
D) horizontal gene transfer

Question

Quizplus · Accepted Answer

Secondary endosymbiosis is the process where a eukaryotic cell engulfs another eukaryotic cell that already contains chloroplasts, leading to the appearance of chloroplasts in some unicellular phototrophic eukaryotes.

What Phenomenon Accounts for the Appearance of Chloroplasts in Some