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What are 3 pieces of evidence that support the theory of endosymbiosis?

What are 3 pieces of evidence that support the theory of endosymbiosis?

Numerous lines of evidence exist, including that mitochondria and chloroplasts have their own circular DNA (prokaryotes also have circular DNA), mitochondria and chloroplasts have a double membrane (the inner membrane would have initially been the ingested prokaryote’s single membrane, and the outer membrane initially …

What evidence do scientists have to support the theory of endosymbiosis?

In addition to the lack of histones, mitochondria and chloroplasts have circular, single stranded DNA. Single stranded, circular DNA is found exclusively in prokaryotes. This evidence supports the endosymbiosis theory because these characteristics would allow the mitochondria and chloroplasts to survive on their own.

What are three properties of mitochondria and chloroplasts that support the Endosymbiotic theory?

Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission. Mitochondria and chloroplasts have their own DNA which is circular, not linear. Mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.

Where do scientists think mitochondria and chloroplasts originated what evidence do they have?

Scientists became convinced that chloroplasts (below right), like mitochondria, evolved from symbiotic bacteria — specifically, that they descended from cyanobacteria (above right), the light-harnessing small organisms that abound in oceans and fresh water.

What evidence did Lynn Margulis provide to support the endosymbiotic theory?

By the time Margulis proposed her theory, evidence for symbiosis theories was available from microscope studies of cells, electron microscopy, genetics, and molecular biology. Such evidence enabled Margulis to support her theories with experimental data.

What major theory did Lynn Margulis propose?

endosymbiotic theory
Among her most important work was the development of the serial endosymbiotic theory (SET) of the origin of cells, which posits that eukaryotic cells (cells with nuclei) evolved from the symbiotic merger of nonnucleated bacteria that had previously existed independently.

How do mitochondria support the endosymbiotic theory?

There is broad evidence to show that mitochondria and plastids arose from bacteria and one of the strongest arguments to support the endosymbiotic theory is that both mitochondria and plastids contain DNA that is different from that of the cell nucleus and that they have their own protein biosynthesis machinery.

Why do scientists believe that mitochondria and chloroplasts arose from prokaryotic cells?

Mitochondria and chloroplasts are believed to have developed from symbiotic bacteria, specifically alpha-proteobacteria and cyanobacteria, respectively. The theory states that a prokaryotic cell was consumed or engulfed by a larger cell. By some unknown reason, the prokaryotic organelle was not consumed.

How do the evidences support the Endosymbiotic origin of mitochondria and chloroplasts?

How did Margulis contribute to the theory of evolution?

Margulis theorized that eukaryotic cells (cells with nuclei) evolved from a symbiosis of bacteria without nuclei that had previously lived independently. This serial endosymbiotic theory, or SET, gave a new view of evolution and helped explain the origin of cells with nuclei.

What was Margulis experiment results?

Margulis reports that the literature lists six general criteria for organelles derived by endosymbiosis. She applies these criteria to the three organelles, mitochondria, plastids, and the basal bodies, and she concludes that they could have evolved by endosymbiosis, but that the eukaryotic cell nucleus could not have.

What is Margulis theory?

Margulis’ theory explained the origin of eukaryote cells, which are the fundamental cell type of most multicellular organisms and form the basis of embryogenesis. After fertilization, embryos develop from a single eukaryotic cell that divides by mitosis.

What did Marie Margulis discover about the structure of cells?

In the late 1960s Margulis (left) studied the structure of cells. Mitochondria, for example, are wriggly bodies that generate the energy required for metabolism. To Margulis, they looked remarkably like bacteria. She knew that scientists had been struck by the similarity ever since the discovery of mitochondria at the end of the 1800s.

How did Lynn Margulis contribute to the theory of endosymbiosis?

Margulis has maintained that earlier symbioses helped to build nucleated cells. For example, spiral-shaped bacteria called spirochetes were incorporated into all organisms that divide by mitosis. Tails on cells such as sperm eventually resulted.

What kind of DNA is found in mitochondria?

The DNA in mitochondria, meanwhile, resembles that within a group of bacteria that includes the type of bacteria that causes typhus (see photos, right). Margulis has maintained that earlier symbioses helped to build nucleated cells.

What did Lynn Margulis study in the 1960s?

In the late 1960s Margulis (left) studied the structure of cells. Mitochondria, for example, are wriggly bodies that generate the energy required for metabolism. To Margulis, they looked remarkably like bacteria.

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