QQuestionBiology
QuestionBiology
What are the three pieces of evidence that support the endosymbiotic theory?
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Step 1:I'll solve this problem by providing the three key pieces of evidence supporting the endosymbiotic theory:
Step 2:: Structural Similarities
The first piece of evidence is the structural similarities between certain organelles (mitochondria and chloroplasts) and prokaryotic cells. These organelles: - Are similar in size to bacteria - Have their own circular DNA - Reproduce independently within the cell through binary fission
Step 3:: Genetic Evidence
The second piece of evidence involves genetic characteristics: - Mitochondria and chloroplasts contain their own separate DNA - This DNA is more similar to bacterial DNA than to the DNA in the cell's nucleus - They have ribosomes that more closely resemble bacterial ribosomes in size and structure
Step 4:: Membrane and Reproduction Characteristics
The third piece of evidence relates to membrane structure and reproduction: - These organelles have double membranes similar to gram-negative bacteria - They can reproduce independently of the cell's division cycle - They have protein synthesis mechanisms similar to those of prokaryotic cells
Final Answer
1. Structural similarities to prokaryotic cells 2. Unique genetic characteristics distinct from nuclear DNA 3. Membrane structure and independent reproduction mechanisms
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