Multiple Choice
According to the endosymbiotic theory, from where did mitochondria evolve?
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5. Cell Components
Endosymbiotic Theory
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Which of the following is considered evidence supporting the endosymbiotic theory?
A
Mitochondria and chloroplasts have their own circular DNA similar to bacteria.
B
Mitochondria and chloroplasts can survive independently outside the cell.
C
Mitochondria and chloroplasts are found in all types of cells, including prokaryotes.
D
Mitochondria and chloroplasts are surrounded by a single membrane.
Verified step by step guidance1
Understand the endosymbiotic theory: This theory suggests that certain organelles, specifically mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells.
Identify key evidence supporting the theory: One of the main pieces of evidence is that mitochondria and chloroplasts have their own circular DNA, which is similar to the DNA found in bacteria.
Evaluate the options: Consider each statement in the context of the endosymbiotic theory. The presence of circular DNA in mitochondria and chloroplasts is a strong indicator of their bacterial origin.
Analyze the incorrect options: Mitochondria and chloroplasts cannot survive independently outside the cell, they are not found in prokaryotes, and they are surrounded by a double membrane, not a single one.
Conclude with the correct evidence: The fact that mitochondria and chloroplasts have their own circular DNA similar to bacteria is the correct evidence supporting the endosymbiotic theory.
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