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The Endosymbiotic Theory

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โˆ™ 2013-02-24 19:16:14
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Q: What theory states that mitochondria were phagocytized by a primitive eukaryotic cell?
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What model is used to explain the origin of mitochondria and chloroplasts within eukaryotic cells?

I believe you are referring to the Endosymbiotic theoryby Lynn Margulis. She came up with the theory that states that eukaryotic cells engulfed smaller bacteria and over time, they became specialized organelles within eukaryotic cells.

Do mitochondria and chloroplasts contain DNA similar to bacterial DNA?

Yes, they do - this is one piece of evidence used to support the endosymbiotic theory. This states that Eukaryotic cells arose from Prokaryotic cells that engulfed other Prokaryotic cells. The DNA found in mitochondria and chloroplasts is similar in size and shape (circular) to that of bacteria.

Discuss evidence that supports the endosymbiotic theory of eukaryotic evolution?

The theory of endosymbiosis states that eukaryotic cells evolved when some prokaryotes were engulfed by others and avoided being digested. The theory states that chloroplasts developed from photosynthetic bacteria and mitochondria from aerobic bacteria. Evidence in support of the endosymbiotic theory includes: 1) The inner membranes of chloroplasts and mitochondria have enzymes and transport systems similar to those found in bacteria 2) They reproduce themselves by splitting into two, similar to the process of binary fission in bacteria 3) They contain circular DNA molecules which are not combined with proteins, like bacteria and unlike the eukaryotic DNA in the nucleus 4) They have their own ribosomes, which are more like bacterial ribosomes than eukaryotic ones.

What is The origin of mitochondria?

The theory about the origin of mitochondria states that they used to be bacteria that developed a symbiotic relationship other cells.

Are there organelles in mitochondria?

A mitochondrion is itself an organelle. However, it does contain its own ribosomes. Ribosomes are regarded as organelles when they occur either free in the cytoplasm or attached to the rough endoplasmic reticulum. The theory of the endosymbiotic origin of mitochondria (and chloroplasts) states that mitochondria are descendants of free-living prokaryotic cells (bacteria). Bacteria contain ribosomes, and so do mitochondria and chloroplasts.

What theory states that mitochondria and chloroplasts are derived from free-living prokaryotic cells?

Endosymbiotic theory describes that.It shows photosynthetic and aerobic bacteria engulfed by eulariyotic cells turned into chloroplst and mitochondria.

Chloroplasts and mitochondria are similar in that they both?

Chloroplasts and mitochondria are similar in that they both maintain some autonomy from the cell. They both contain their own genetic material separate from the nucleus of the cell. This has lead to the endosymbiotic theory - which states that chloroplasts and mitochondria were once unicellular organisms engulfed by and then incorporated into another cell.

What are the character states shared by the ancestor or outgroup of a clade called?

Plesiomorphy. Shared '' primitive '' characteristics of the ancestor or outgroup of a clade.

Why do Mitochondrial have DNA?

Mitochondria are structures within cells that convert the energy from food into a form that cells can use. Although most DNA is packaged in chromosomes within the nucleus, mitochondria also have a small amount of their own DNA. This genetic material is known as mitochondrial DNA or mtDNATo provide some autonomy for its function the mitochondria have their own DNA. One cell theory states that some bacteria invaded the cell and established a symbiotic relationship. Mitochondria and chloroplasts are such microbes establishing permanent symbiotic relationship with the plant cell.

What is the evidence for the endosymbiotic theory?

The endosyymbiotic theory stated that the mitochondria formed through the endosymbiosis of a proteobacteria. It also states that chloroplast formed from the endosymbiosis of a cyanobacteria.

How did the first eukaryotes evolve?

Eukaryotes evolved from a process call endosymbiosis. Endosymbiosis states that eukaryotes started as two separate bacterium. The bigger bacteria engulfed the smaller. This is how the mitochondria is enclosed in the cell. There is evidence of this because the mitochondria has its on cell membrane and contains its own DNA.

Are people with Surname nag sc's?

yes , nag is belonging to st community. it the Indian primitive ancient civilization which was basically founded in Odisha then it spread in the other states.

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