Some organelles in eukaryotic cells are thought to have
A) originated from extracellular symbiotic relationships.
B) their own endoplasmic reticulum.
C) their own mitochondria.
D) originated from endosymbiotic relationships.
E) the ability to live free of the host cell.

Question

Quizplus · Accepted Answer

Some organelles, such as mitochondria and chloroplasts, are thought to have originated from endosymbiotic relationships, where one prokaryotic cell was engulfed by another and the two formed a mutually beneficial relationship. Over time, the engulfed cell evolved into an organelle within the host cell. This theory is supported by the fact that mitochondria and chloroplasts have their own DNA and ribosomes, similar to prokaryotic cells.

Some Organelles in Eukaryotic Cells Are Thought to Have