Multiple Choice
Which of the following statements about endosymbiosis is correct?
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5. Cell Components
Endosymbiotic Theory
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Which of the following pieces of evidence supports the endosymbiotic theory?
A
Prokaryotic cells lack membrane-bound organelles.
B
Eukaryotic cells can perform photosynthesis.
C
Mitochondria and chloroplasts have their own circular DNA similar to bacterial DNA.
D
Eukaryotic cells have a nucleus that contains linear DNA.
Verified step by step guidance1
Understand the endosymbiotic theory: It suggests that certain organelles, like mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells.
Identify key characteristics of mitochondria and chloroplasts: They have their own DNA, which is circular, similar to the DNA found in prokaryotes (bacteria).
Compare the DNA structure: Mitochondria and chloroplasts have circular DNA, which is a trait shared with prokaryotic cells, supporting the idea that they originated from bacteria.
Consider the independence of organelles: The presence of their own DNA allows mitochondria and chloroplasts to replicate independently within the eukaryotic cell, further supporting their bacterial origin.
Evaluate the evidence: The fact that mitochondria and chloroplasts have their own circular DNA similar to bacterial DNA is a strong piece of evidence supporting the endosymbiotic theory.
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