Endosymbiotic theory question Select ALL of the following statements which provi
ID: 81762 • Letter: E
Question
Endosymbiotic theory question
Select ALL of the following statements which provide evidence to support the endosymbiont theory of the origin of mitochondria. Mitochondria contain ribosomes, similar to prokaryotic ribosomes. Both mitochondria and prokaryotes are semiautonomous. Mitochondria contain small circular DNA molecules which resemble bacterial genomes. The inner membranes of both prokaryotes and mitochondria are highly convoluted which increases surface area for energy production. The mode of replication of mitochondria is by binary fission, similar to that of prokaryotes. Mitochondria are exclusively maternally inherited, similar to bacterial inheritance. The cell wall of mitochondria is similar in composition to that of bacteria. Different types of cell have different numbers of mitochondria.Explanation / Answer
The statements which support the endosymbiont theroy of the origin of mitochondria are
1. Mitochondria contain ribosomes (70S0) similar to prokaryotic ribosomes (70S).
2. Mitochondria contain small circular DNA molecules which resembles bacterial genomes.
3. The mode of replication of mitochondria is by binary fission, similar to that of prokaryotes.
In addition, mitochondria and bacterial cells have similar sizes of about 1- 10 micrometers. Also the electron transport chain is found on the plasma membrane surrounding the bacterial cell or mitochondria.
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