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What hypothesis has Lynn Margulis proposed to account for the presence of DNA in mitochondria and chloroplasts?
theory of endosymbiosis
Lynn’s enduring place in science was earned soon thereafter, with the publication of her theory of endosymbiosis, a radical and, as it turned out, lasting explanation for the origin of mitochondria and chloroplasts, the organelles responsible for energy metabolism in eukaryotic cells.Rab. I 1, 1433 AH
What is the Endosymbiotic theory and what evidence supports it?
The strongest piece of evidence for the endosymbiotic theory is the fact that mitochondria and chloroplasts have their own circular DNA, prokaryote fashion, and can still replicate, transcribe and translate some proteins. Their ribosomes are also fashioned as a prokaryotes would be.Rab. I 26, 1441 AH
What is meant by the endosymbiotic theory?
The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). This theory explains the origin of eukaryotic cells.
What is endosymbiosis theory?
The endosymbiotic theory states that some of the organelles in today’s eukaryotic cells were once prokaryotic microbes. They eventually lost their cell wall and much of their DNA because they were not of benefit within the host cell. Mitochondria and chloroplasts cannot grow outside their host cell.Jum. I 19, 1442 AH
When was the Endosymbiotic theory developed?
1920s
Ivan Wallin advocated the idea of an endosymbiotic origin of mitochondria in the 1920s. The Russian botanist Boris Kozo-Polyansky became the first to explain the theory in terms of Darwinian evolution. In his 1924 book A New Principle of Biology.
What evidence did Lynn Margulis cite to support endosymbiotic theory?
In the now generally accepted endosymbiotic theory, Margulis demonstrated that current plant cells resulted from the merging of separate ancestors, the chloroplast evolving from endosymbiotic cyanobacteria (autotrophic prokaryotes).
What evidence supports the theory of endosymbiosis quizlet?
What evidence exists to support the endosymbiotic origins of eukaryotic cells? The endosymbiotic theory is based on mitochondria and chloroplasts of eukaryotes. Both structures have characteristics (such as their own DNA and the ability to self-replicate) of independent prokaryotes.