Multiple Choice
Which of the following pieces of evidence supports the endosymbiotic theory?
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5. Cell Components
Endosymbiotic Theory
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What does the endosymbiotic theory propose about the origin of certain organelles in eukaryotic cells?
A
They originated from the invagination of the plasma membrane.
B
They evolved independently within eukaryotic cells.
C
They were formed through the fusion of multiple eukaryotic cells.
D
They originated from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.
Verified step by step guidance1
Understand the endosymbiotic theory: It proposes that certain organelles in eukaryotic cells, such as mitochondria and chloroplasts, originated from free-living prokaryotes.
Recognize the process of endosymbiosis: An ancestral eukaryotic cell engulfed free-living prokaryotic cells, which then formed a symbiotic relationship.
Identify the evidence supporting this theory: Mitochondria and chloroplasts have their own DNA, which is similar to bacterial DNA, and they replicate independently within the cell.
Consider the implications: This theory suggests a significant evolutionary event where eukaryotic cells gained new functions through the acquisition of these organelles.
Conclude with the correct understanding: The endosymbiotic theory explains the origin of mitochondria and chloroplasts as a result of ancient symbiotic relationships between prokaryotes and eukaryotes.
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