Place the following events in order to describe the process of endosymbiosis A. Cell engulfs chloroplast. B. Cell engulfs mitochondrion. C. Cell has a nucleus and other organelles. A. A. C, B, / B. B, A, C /C A, B, C /D. C, A, B /E. (a) or (d)
Answers
Answer:
According to me, the sequence should be
option d) i.e. C) ⇒ A) and B)
Explanation:
Evidence points to endosymbiosis as the answer to the puzzle. Symbiosis is a relationship in which organisms from two separate species live in a close, dependent relationship. Endosymbiosis (endo- = “within”) is a specific type of symbiosis where one organism lives inside the other. Bacteria, mitochondria, and chloroplasts are similar in size. Bacteria also have DNA and ribosomes similar to those of mitochondria and chloroplasts. Based on this and other evidence, scientists think host cells and bacteria formed endosymbiotic relationships long ago, when individual host cells took in aerobic (oxygen-using) and photosynthetic bacteria but did not destroy them. Through millions of years of evolution, the aerobic bacteria became mitochondria and the photosynthetic bacteria became chloroplasts.
(reference: khan academy article, no copyright intended)
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