Multiple Choice
Which of the following is the strongest evidence supporting the endosymbiotic theory?
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5. Cell Components
Endosymbiotic Theory
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Which of the following is NOT evidence for the endosymbiotic origins of mitochondria and chloroplasts?
A
Mitochondria and chloroplasts have their own circular DNA similar to bacteria.
B
Mitochondria and chloroplasts are found in all eukaryotic cells.
C
Mitochondria and chloroplasts have double membranes.
D
Mitochondria and chloroplasts can replicate independently of the cell.
Verified step by step guidance1
Understand the concept of endosymbiotic theory: This theory suggests that mitochondria and chloroplasts originated from free-living bacteria that were engulfed by ancestral eukaryotic cells.
Identify key evidence supporting the endosymbiotic theory: Mitochondria and chloroplasts have their own circular DNA, similar to bacteria, which supports the idea that they were once independent organisms.
Consider the structural evidence: Both mitochondria and chloroplasts have double membranes, which is consistent with the engulfing process described by the endosymbiotic theory.
Examine the replication process: Mitochondria and chloroplasts can replicate independently of the cell, similar to how bacteria reproduce, further supporting their bacterial origins.
Evaluate the statement about eukaryotic cells: The claim that mitochondria and chloroplasts are found in all eukaryotic cells is incorrect as evidence for endosymbiotic origins, because not all eukaryotic cells contain chloroplasts (e.g., animal cells do not).
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