Multiple Choice
Which of the following statements provides evidence for the endosymbiotic theory?
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5. Cell Components
Endosymbiotic Theory
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Which of the following is evidence for the endosymbiotic theory?
A
Mitochondria and chloroplasts are surrounded by a single membrane.
B
Mitochondria and chloroplasts have their own DNA similar to bacterial DNA.
C
Mitochondria and chloroplasts are found in all prokaryotic cells.
D
Mitochondria and chloroplasts can survive independently outside the cell.
Verified step by step guidance1
Understand the endosymbiotic theory: It suggests that mitochondria and chloroplasts originated as free-living bacteria that were engulfed by ancestral eukaryotic cells.
Identify key evidence supporting the theory: Mitochondria and chloroplasts have their own DNA, which is similar to bacterial DNA, indicating a prokaryotic origin.
Consider the structure of mitochondria and chloroplasts: They have double membranes, consistent with the engulfing mechanism proposed by the theory.
Evaluate the independence of mitochondria and chloroplasts: While they have their own DNA, they cannot survive independently outside the cell, as they rely on the host cell for certain functions.
Conclude with the correct evidence: The presence of their own DNA similar to bacterial DNA is a strong indicator of their endosymbiotic origin.
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