U.S. producers are growing pumpkins competitively and pumpkin weigh-offs are happening at county fairs around the country. While some growers are in it for fun, others are trying to beat the amazing 1,810-pound (821- kg) giant, the 2010 record for the worldâs biggest pumpkin.
The Endosymbiotic Theory is a theory about how mitochondria and chloroplasts formed. The theory suggests that both the mitochondria and chloroplasts were once prokaryotic cells that were ingested but not digested by eukaryotic cells. This would explain why both have their own DNA.he strongest piece of evidence for the endosymbiotic theory is the fact that mitochondria and chloroplasts have their own circular DNA, prokaryote fashion, and can still repl â¦ icate, transcribe and translate some proteins. Their ribosomes are also fashioned as a prokaryotes would be.
Because they evolved without them. Bacteria are a type of prokaryote. All prokaryotes lack membrane bound organelles. This is due to its evolutionary history. It is generally accepted that eukaryotes evolved after prokaryotes, thus membrane bound organelles were not the norm. The most commonly proposed idea, the endosymbiotic theory, suggests that eukaryotes were formed by endocytosis. That is, larger cells would consume smaller cells.