Chloroplasts have an outer and an inner membrane that separate the stroma and th
ID: 312692 • Letter: C
Question
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 an adaptation of the symbiotic cyanobacteria to protect it from fusing with lysosomes present in the cytoplasm of the ancient “host” cell.
b. It is a nonfunctional remmant resulting from the amplification of the inner membrane of teh chorplast to increase its surface area
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 an adaptation of the symbiotic cyanobacteria to protect it from fusing with lysosomes present in the cytoplasm of the ancient “host” cell.
b. It is a nonfunctional remmant resulting from the amplification of the inner membrane of teh chorplast to increase its surface area
c. It is the remnant of the ancient host cell's plasma membrane following endocytosis of the cyanobacterium.Explanation / Answer
The correct answer is option C. The chloroplast and mitochondria evolved due to endocytosis of ancient prokaryotes. The part of the cyanobacteria's plasma membrane left becomes the outer membrane of the chloroplasts.
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