Scelta multipla
Which of the following is a benefit that eukaryotes gained via endosymbiosis?
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27. Protists
Evolution of Protists
Scelta multipla
Which of the following is a characteristic that you could look for to determine if a cell has undergone secondary endosymbiosis?
A
A rough endoplasmic reticulum.
B
A photosynthetic organelle with 3 or more membranes.
C
A complex nucleus & endomembrane system.
D
A chloroplast.
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Understand the concept of secondary endosymbiosis: This is a process where a eukaryotic cell engulfs another eukaryotic cell that has already undergone primary endosymbiosis, resulting in an organelle with multiple membranes.
Identify the key characteristic of secondary endosymbiosis: The engulfed cell typically has a photosynthetic organelle, such as a chloroplast, with additional membranes due to the engulfing process.
Compare the options given: A rough endoplasmic reticulum, a complex nucleus & endomembrane system, and a chloroplast are typical features of eukaryotic cells but do not specifically indicate secondary endosymbiosis.
Focus on the number of membranes: A photosynthetic organelle with 3 or more membranes is indicative of secondary endosymbiosis, as the additional membranes are remnants of the engulfed eukaryotic cell.
Conclude that the presence of a photosynthetic organelle with 3 or more membranes is the characteristic that suggests secondary endosymbiosis has occurred.
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