The endosymbiotic theory describes the origin of
A) the nucleus & ribosomes.
B) the Golgi and endoplasmic reticulum.
C) lysosomes and the cytoskeleton.
D) mitochondria & chloroplasts.

Question

Quizplus · Accepted Answer

The endosymbiotic theory suggests that mitochondria and chloroplasts were once free-living bacteria that were engulfed by a larger cell, leading to a symbiotic relationship beneficial for both, and eventually becoming integral parts of the cell.

The Endosymbiotic Theory Describes the Origin of