Which description best supports the endosymbiotic theory of organelles?

Question

Quizplus · Accepted Answer

The endosymbiotic theory suggests that eukaryotic cells obtained mitochondria and plastids by engulfing free-living bacteria and establishing a symbiotic relationship with them. Mitochondria were derived from aerobic bacteria while chloroplasts, which are a type of plastid, were derived from cyanobacteria. This is supported by evidence such as the fact that mitochondria and chloroplasts have their own DNA and ribosomes, similar to free-living bacteria, and the similarities in size, shape, and structure between these organelles and bacteria. Option A is incorrect because chloroplasts were derived from cyanobacteria, which are a type of aerobic bacteria. Options C and D are incorrect because nuclei and flagella are not believed to have originated from free-living bacteria in the same way as mitochondria and chloroplasts did.

Which Description Best Supports the Endosymbiotic Theory of Organelles