Which theory for the evolution of mitochondria in eukaryotic cells is depicted in the image below?

Question

BlackTom AI · Accepted Answer

The question asks: Which theory for the evolution of mitochondria in eukaryotic cells is depicted?

In the image, the sequence shows an ancestral eukaryotic cell with a prokaryotic cell that becomes enclosed inside a vesicle, later giving rise to organelles with inner and outer mitochondrial membranes and a mitochondrion-like structure. This stepwise depiction aligns with the endosymbiotic theory, which posits that mitochondria originated from free-living prokaryotes that were engulfed by a host cell and established a mutualistic endosymbiotic relationship.

To unpack the reasoning behind this alignment:
- The first stage shows a prokaryotic cell associating with or being taken up by a larger host cell, which mirrors the idea of engulfment and symbiosis rather than mere phagocytosis or abiotic origins.
- The second stage depicts the formation of a vesicle containing the prokaryote, consistent with the internalization concept in endosymbiosis, where the engulfed organism becomes a confined organelle within the host.
- The third stage clearly presents a double-membrane structure labeled as the outer and inner mitochondrial membranes, which is a hallmark feature supporting endosymbiotic origins, since mitochondria possess their own membranes and replicate semi-autonomously.

If alternative theories were on the table, such as autogenous origin (where mitochondrial components arise solely from the host cell’s own membranes) or other non-endosymbiotic ideas, they would struggle to account for the mitochondrion’s distinct double-membrane structure, its own circular DNA, and evidence of bacterial ancestry in mitochondrial ribosomes. The image’s emphasis on an engulfed prokaryotic ancestor and the emergence of a structured, membrane-bound organelle maps directly onto the core predictions of endosymbiotic theory.

In summary, the depicted progression—from a prokaryote being housed inside a host cell to the formation of mitochondria with two membranes—embodies the endosymbiotic framework for mitochondrial evolution.

Which theory for the evolution of mitochondria in eukaryotic cells is depicted in the image below?单项选择题

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