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.
The theory postulates that the mitochondria evolved from aerobic bacteria (probably proteobacteria, related to the rickettsias), and that the chloroplast evolved from endosymbiotic cyanobacteria (autotrophic prokaryotes).The evidence for this theory is compelling as a whole, and it is now generally accepted.ndosymbiotic theory. The endosymbiotic theory concerns the origins of mitochondria and chloroplasts, which are organelles of eukaryotic cells. According to this theory, these originated as prokaryotic endosymbionts, which came to live inside eukaryotic cells.