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Why do scientists suspect that mitochondria and chloroplasts were originally prokaryotic cells?
Wiki User
∙ 11y ago
Scientists saw that the membranes of mitochondria and chloroplasts resembled the cell membranes of free-living prokaryotes. This led to two hypotheses. One proposed that mitochondria evolved from endosymbiotic prokaryotes that were able to use oxygen to generate energy rich ATP. The other proposed that chloroplasts evolved from endosymbiotic prokaryotes that had he ability to photosynthesize. Mitochondria and chloroplasts share many features with free-living bacteria, such as there ribosomes have similar size and structure and they reproduce by binary fission. These similarities provide strong evidence of a common ancestry between bacteria and the organelles of living eukaryotic cells.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoTheir genetic structure more closely resembles that of prokaryotic bacteria than the nuclear material of the cells in which they reside.
Wiki User
∙ 9y agoBoth mitochondria and chloroplast contain their own DNA. They also divide at various times and not always when the rest of the cell divides.
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What parts of a cell do scientists think were once free-living organisms?
Mitochondria and chloroplasts are thought to have once been a free prokaryotic cell.
How do scientists think mitochondria originated?
Mitochondria are evolved from bacteria.Symbiotic living aerobic bacteria turned into mitochondria.
How do the finding of margulis and other scientists-that mitochondria and cholarplasts have third own DNA like a cell nucleus-support the hypothesis of endosymbiosis?
concept that mitochondria and chloroplasts are the result of years of evolution initiated by the endocytosis of bacteria and blue-green algae which, instead of becoming digested, became symbiotic.
Where do scientists believe mitochondria and chloroplasts originated?
Some scientists believe that mitochondria and chloroplasts were at one time independent-living bacteria that were engulfed by eukaryotic cells, forming an endosymbiotic relationship. This is because both mitochondria and chloroplasts have their own DNA and replicate themselves within the cells in which they occur.
Is mitochondria green?
No. As far as many scientists are concerned, mitochondria have no colour. Chloroplast, the organelle which creates glucose in plants, is green.
What parts of a cell do scientists think were once free-living organisms?
Mitochondria and chloroplasts are thought to have once been a free prokaryotic cell.
Do bacteria have plastids?
Some bacteria have chloroplasts. For example, cyanobacteria. They are photosynthetic bacteria No, bacteria do not have chloroplasts because they are prokaryotic which means they can't have membrane bound organelles other than ribosomes.. Chloroplasts are membrane bound organelles. As for the cyanobacteria, they are indeed photosynthetic, but they still don't have chloroplasts. It is somewhat misleading. They were once called blue-green algae (they even fooled earlier scientists) but are now considered bacteria because they lack a membrane bound nucleus and chloroplasts.
Why did scientists place bacteria in their kingdom the monera?
Scientists placed bacteria in their own kingdom, the Monera, because bacteria lack the nuclei, mitochondria, and chloroplasts found in other forms of life
Why did the scientists place bacteria in their own kingdom the Monera?
Scientists placed bacteria in their own kingdom, the Monera, because bacteria lack the nuclei, mitochondria, and chloroplasts found in other forms of life
How do some scientists think that the first eukaryotes evolved?
By various bacteria ingesting but not digesting other bacteria, most likely the precursors of mitochondria (and/or chloroplasts).
Why do scientists believe that mitochondria may have evolved from bacteria?
This theory is called the endosymbiotic theory. Mitochondria and chloroplasts both have their own ribosomes and their own genetic material, and they are also membrane-bound organelles. This is evidence that a long time ago, a prokaryotic cell incorporated another prokaryotic cell within itself, in its cytoplasm. This eventually came to create the first chloroplasts and mitochondria.
Why did scientist place bacteria in Their own kingdom monera?
Scientists placed bacteria in their own kingdom, the Monera, because bacteria lack the nuclei, mitochondria, and chloroplasts found in other forms of life
What organelle produces carbohydrates for the plant cell?
It is known as the chloroplast. Due to the fact that the chloroplast has its own set of DNA, scientists believe that the chloroplasts were originally prokaryots that invaded eukaryotic cells and were beneficial, so the eukaryotic cells did not try to destroy it (endosymbiotic theory).
How do scientists think mitochondria originated?
Mitochondria are evolved from bacteria.Symbiotic living aerobic bacteria turned into mitochondria.
How do the finding of margulis and other scientists-that mitochondria and cholarplasts have third own DNA like a cell nucleus-support the hypothesis of endosymbiosis?
concept that mitochondria and chloroplasts are the result of years of evolution initiated by the endocytosis of bacteria and blue-green algae which, instead of becoming digested, became symbiotic.
What does endosymbiotic theory suggest?
The endosymbiotic theory suggests that eukaryotic cells arose from a mutual relationship of prokaryotic cells. Evidence shows that prokaryotic and eukaryotic cells share many characteristics. The theory focuses on the origins of the chloroplasts and mitochondria of photosynthetic prokaryotes and aerobic heterotrophs, respectively. The similarities in characteristics include: 1. They both go through binary fission to reproduce 2. Eukaryotes are about the same size as eubacteria 3. The ribosomes of the eukaryotes, when examined with great detail, more resemble those of a prokaryote than a eukaryote Scientists believe that archezoa, a eurkaryotic organism, most resembles the prokaryotes. It does not contain mitochondria.
Is mitochondria green?
No. As far as many scientists are concerned, mitochondria have no colour. Chloroplast, the organelle which creates glucose in plants, is green.
