Multiple Choice
Which of the following can be cited as evidence for the theory of endosymbiosis?
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5. Cell Components
Endosymbiotic Theory
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Which of the following is true of secondary endosymbiosis?
A
It leads to the development of chloroplasts directly from cyanobacteria.
B
It involves a eukaryotic cell engulfing another eukaryotic cell that has already undergone primary endosymbiosis.
C
It results in the formation of mitochondria in eukaryotic cells.
D
It occurs when a prokaryotic cell engulfs another prokaryotic cell.
Verified step by step guidance1
Understand the concept of endosymbiosis: Endosymbiosis is a theory that explains how eukaryotic cells evolved from prokaryotic cells. It involves one cell engulfing another, leading to a symbiotic relationship.
Differentiate between primary and secondary endosymbiosis: Primary endosymbiosis occurs when a eukaryotic cell engulfs a prokaryotic cell, such as a cyanobacterium, which eventually becomes an organelle like a chloroplast. Secondary endosymbiosis involves a eukaryotic cell engulfing another eukaryotic cell that has already undergone primary endosymbiosis.
Identify the role of secondary endosymbiosis: In secondary endosymbiosis, the engulfed eukaryotic cell typically contains chloroplasts that originated from primary endosymbiosis. This process leads to the diversification of eukaryotic lineages, particularly in algae.
Clarify the incorrect statements: Secondary endosymbiosis does not lead directly to the formation of chloroplasts from cyanobacteria; this is a result of primary endosymbiosis. It also does not result in the formation of mitochondria, which are believed to have originated from a separate primary endosymbiotic event involving an ancestral proteobacterium.
Conclude with the correct statement: The correct understanding of secondary endosymbiosis is that it involves a eukaryotic cell engulfing another eukaryotic cell that has already undergone primary endosymbiosis, leading to complex cellular structures and diversity in eukaryotic organisms.
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