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If the chloroplast is the result of endosymbiosis, what membrane of the chloroplast represents the plasma membrane of the ancestral cyanobacteria?

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marianaegarciaperedo

According to the Endosymbiotic theory, free-living bacteria were phagozited by another cell. The internal membrane of chloroplast represents the plasma membrane of cyanobacteria.

What does the endosymbiotic theory state?

The endosymbiotic theory proposes that mitochondria and chloroplasts were once free-living bacteria that were phagocytized by another cell but not digested.

These bacteria got to adapt to their host, and both cells became interdependent.

Both organelles have many similarities with other free-living bacteria.

  • Chloroplasts probably derivate from cyanobacteria.
  • Mitochondria derivate from rickettsias.

From the phagocytosis moment, these two cells became so dependent on each other, that they could not survive without the other one.

Chloroplasts and mitochondria share some traits with free-living bacteria, that support the theory.

  • Both organelles present their genetic material. This DNI is independent of the cell's DNA, is bi-catenary and circular, identical to the bacterial DNA, and very different from the one of the eukaryotic cells.

  • Both organelles divide by binary fission, not by mitosis, and can synthesize their ribosomes and organelles.

  • Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the bacterial membrane, while the external membrane looks like the eukaryotic one.

In fact, in this internal membrane are placed the energy centers, just as it occurs in bacterias membrane.

  • Finally, the sizes of the organelles are similar to the size of some procaryotes.

According to this information, we could say that membrane of the chloroplast that represents the plasma membrane of the ancestral cyanobacteria is the internal membrane.

You can learn more about the endosymbiotic theory at

https://brainly.com/question/583859

https://brainly.com/question/2957447

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