Chloroplasts have an outer and an inner membrane that separate the stroma and thylakoid membrane from the cytoplasm. What is believed to be the origin of the outer membrane of the chloroplast?
A) It is the remnant of the ancient host cell's plasma membrane following endocytosis of the cyanobacterium.
B) It is a nonfunctional remnant resulting from the amplification of the inner membrane of the chloroplast to increase its surface area.
C) It is an adaptation of the symbiotic cyanobacteria to protect it from fusing with lysosomes present in the cytoplasm of the ancient "host" cell.
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