Mitochondria and plastids are believed to have once been independent organisms because they
A) contain their own DNA.
B) have flagella.
C) have glyoxysomes.
D) make vesicles.
E) have nuclei.

Question

Quizplus · Accepted Answer

Mitochondria and plastids both contain their own DNA, which suggests that they were once independent organisms that were engulfed by other cells and became symbiotic organelles. The other options do not provide evidence for their previous independence.

Mitochondria and Plastids Are Believed to Have Once Been Independent