Which of the following was derived from an ancestral cyanobacterium?
A) chloroplast
B) mitochondrion
C) flagella
D) mitosome

Question

Quizplus · Accepted Answer

Chloroplasts are believed to have originated from an ancestral cyanobacterium through endosymbiosis. The cyanobacterium was engulfed by a eukaryotic cell and became a symbiont, eventually evolving into a chloroplast. This is supported by the fact that chloroplasts have their own DNA, similar to that of bacteria.

Answer: B
 Mitochondria are also believed to have originated from an ancestral bacterium that was engulfed by a eukaryotic cell and became a symbiont, eventually evolving into a mitochondrion. Mitochondria have their own DNA, similar to that of bacteria.

Answer: D
 Mitosomes are organelles that are reduced forms of mitochondria and are found in some anaerobic eukaryotes. They do not have their own DNA and are not believed to be derived from an ancestral bacterium.

Therefore, the best choices are A and B.

Which of the Following Was Derived from an Ancestral Cyanobacterium