Definition: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: What is the main topic of the paragraph?, Context: There are some common misconceptions about the outer and inner chloroplast membranes. The fact that chloroplasts are surrounded by a double membrane is often cited as evidence that they are the descendants of endosymbiotic cyanobacteria. This is often interpreted as meaning the outer chloroplast membrane is the product of the host's cell membrane infolding to form a vesicle to surround the ancestral cyanobacteriumwhich is not trueboth chloroplast membranes are homologous to the cyanobacterium's original double membranes.
Output:
common misconceptions about the outer and inner chloroplast membranes