Multiple Choice
Which of the following is not evidence for the endosymbiotic theory?
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5. Cell Components
Endosymbiotic Theory
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Which explanation correctly describes the origin of mitochondria according to the endosymbiotic theory?
A
Mitochondria originated from the nucleus of eukaryotic cells.
B
Mitochondria evolved from the internal folding of the eukaryotic cell membrane.
C
Mitochondria originated from free-living aerobic bacteria that were engulfed by ancestral eukaryotic cells.
D
Mitochondria were formed from the fusion of multiple eukaryotic cells.
Verified step by step guidance1
Understand the endosymbiotic theory: This theory suggests that certain organelles, like mitochondria, originated as free-living bacteria that were engulfed by larger ancestral eukaryotic cells.
Identify the key characteristics of mitochondria: Mitochondria have their own DNA, which is circular and similar to bacterial DNA, and they replicate independently within the cell, supporting the idea of a bacterial origin.
Evaluate the options: The first option suggests mitochondria originated from the nucleus, which is inconsistent with the endosymbiotic theory. The second option suggests internal folding of the membrane, which does not align with the theory's explanation of an external origin.
Consider the correct explanation: The correct explanation is that mitochondria originated from free-living aerobic bacteria that were engulfed by ancestral eukaryotic cells, which is consistent with the endosymbiotic theory.
Eliminate incorrect options: The last option suggests mitochondria were formed from the fusion of multiple eukaryotic cells, which does not fit the endosymbiotic theory. Thus, the correct explanation is the one involving free-living aerobic bacteria.
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