Refer to the figure, which shows endosymbiotic events in the evolution of chloroplasts. After millions of generations, the events in part A of the figure led to which of the following?
A) The DNA of the host cell replaced all prokaryotic DNA in the chloroplast.
B) The chloroplast retained prokaryotic DNA that codes for proteins in the chloroplast.
C) The DNA of the host cell moved to the nucleus of the engulfed cell.
D) The chloroplast lost its entire prokaryotic DNA, which was replaced with DNA from the host cell.
E) The chloroplast retained its ability to survive outside of the host.

Question

Refer to the figure, which shows endosymbiotic events in the evolution of chloroplasts.  After millions of generations, the events in part A of the figure led to which of the following?
A) The DNA of the host cell replaced all prokaryotic DNA in the chloroplast. 
B) The chloroplast retained prokaryotic DNA that codes for proteins in the chloroplast. 
C) The DNA of the host cell moved to the nucleus of the engulfed cell. 
D) The chloroplast lost its entire prokaryotic DNA, which was replaced with DNA from the host cell. 
E) The chloroplast retained its ability to survive outside of the host.

Quizplus · Accepted Answer

The endosymbiotic events in part A of the figure show the engulfment of a cyanobacterium by a eukaryotic cell, which eventually led to the evolution of chloroplasts. During this process, the chloroplast retained some of its prokaryotic features, including its own DNA. Therefore, option B is the correct choice as it states that the chloroplast retained its prokaryotic DNA that codes for proteins in the chloroplast. The other options are incorrect as there is no evidence to suggest that the DNA of the host cell replaced all the prokaryotic DNA in the chloroplast, the DNA of the host cell moved to the nucleus of the engulfed cell, or that the chloroplast lost its entire prokaryotic DNA, which was replaced with DNA from the host cell. Option E is also incorrect as the figure does not provide any information about the chloroplast's ability to survive outside of the host.

Refer to the Figure, Which Shows Endosymbiotic Events in the Evolution