What Evidence Supports The Endosymbiotic Theory

2025-08-01 18:04:26 385
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3 Answers

Zoe
Zoe
2025-08-02 09:00:28
I’ve always been fascinated by how life evolved, and the endosymbiotic theory is one of those mind-blowing ideas that just makes sense. The evidence starts with mitochondria and chloroplasts—they have their own DNA, separate from the cell’s nucleus, and it’s circular like bacterial DNA. That’s a huge clue right there. They also replicate independently, just like bacteria, by binary fission. The way they’re surrounded by double membranes suggests they were once free-living organisms engulfed by another cell. Plus, their ribosomes are more similar to bacterial ribosomes than eukaryotic ones. When you put all these pieces together, it’s hard not to see the connection. The theory explains why these organelles function so differently from the rest of the cell, and it’s backed by genetic and structural evidence that’s pretty hard to ignore.
Colin
Colin
2025-08-07 22:19:15
The endosymbiotic theory is one of the coolest concepts in biology, and the evidence supporting it is both diverse and compelling. Mitochondria and chloroplasts have their own genomes, which are strikingly similar to those of bacteria. Their DNA is circular, lacks histones, and encodes proteins essential for their function—just like in prokaryotes. They also divide independently of the host cell through a process resembling bacterial binary fission, not mitosis. Another smoking gun is the presence of double membranes around these organelles, likely a remnant of the ancestral engulfment event.

Beyond structure, biochemical evidence seals the deal. The ribosomes in mitochondria and chloroplasts are 70S, the same size as bacterial ribosomes, not the 80S found in eukaryotic cytoplasm. Antibiotics that target bacterial ribosomes also affect these organelles, further linking them to prokaryotes. Genetic studies show that mitochondrial genes are most closely related to those of alpha-proteobacteria, while chloroplast genes align with cyanobacteria. The theory isn’t just a neat idea—it’s a framework supported by layers of evidence from microscopy to molecular biology.
Finn
Finn
2025-08-07 23:27:22
the endosymbiotic theory feels like solving a puzzle. The biggest pieces of evidence come from mitochondria and chloroplasts behaving like tiny organisms within cells. They’ve got their own DNA, which is circular and unbound by histones—just like bacteria. Their ribosomes are bacterial-style 70S, not the 80S found in the rest of the cell. Even their reproduction is suspiciously prokaryotic, splitting via binary fission rather than following the cell’s division cycle.

The double membrane surrounding these organelles is another giveaway. It’s as if the host cell trapped a bacterium and never let go. Genetic sequencing has nailed it down further, showing mitochondrial DNA shares a close kinship with alpha-proteobacteria, while chloroplast DNA mirrors cyanobacteria. The theory isn’t just plausible; it’s the most elegant explanation for why these organelles operate like semi-independent entities. From biochemistry to genetics, the evidence stacks up irresistibly.
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