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Unformatted text preview: Origin of the eukaryote type . Biologists in general agree that early organisms were prokaryotes that developed ways to survive on a young Earth whose atmosphere and conditions were much different from today's. Descendants of these ancient prokaryotesthe organisms of todaycarry in their genes solutions to old problems as well as modifications made over 3.5 billion years in response to changing Earth conditions. Serial endosymbiotic theory The mitochondria and chloroplasts of plants differ from other organelles in their semi-independence. In many ways they resemble bacteria: Both bacteria and the organellescan divide, their DNA is organized similarly, and both have small ribosomes. Additionally, antibiotics inhibit protein synthesis in ribosomes of mitochondria, chloroplasts, and bacteria, but have no effect on synthesis in cytosomal ribosomes of eukaryotic cells. These structural and physiological differences lead some cytosomal ribosomes of eukaryotic cells....
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- Fall '08