The endosymbiotic theory provides an explanation for the origin of chloroplasts. Which trait of chloroplasts supports this explanation?
Chloroplasts do not reproduce.
Chloroplasts rely on proteins that are made by the cell.
Chloroplasts are larger than prokaryotic cells.
Chloroplasts have their own DNA.
Answers
Answer:
i guess the 4th one is correct
Explanation:
Explanation:
The Endosymbiotic Theory was first proposed by former Boston University Biologist Lynn Margulis in the 1960's and officially in her 1981 book "Symbiosis in Cell Evolution". Although now accepted as a well-supported theory, both she and the theory were ridiculed by mainstream biologists for a number of years. Thanks to her persistance, and the large volumes of data that support this hypothesis gathered by her and many other scientists over the last 30 years, biology can now offer a plausible explanation for the evolution of eukaryotes. [Quote]
Dr. Margulis was doing reserarch on the origin of eukaryotic cells. She looked at all the data about prokaryotes, eukaryotes, and organelles. She proposed that the similarities between prokaryotes and organelles, together with their appearance in the fossil record, could best be explained by "endo-symbiosis".
[Endo = "within"]
[Endocytosis = (cyto = cell) a process of 'cell eating' - cells are engulfed, but then usually digested as food....]
[Endosymbiosis = cells are engulfed, but not digested...cells live together is a mutually benefitting relationship, or symbiosis]
Her hypothesis originally proposed that:
mitochondria are the result of endocytosis of aerobic bacteria
chloroplasts are the result of endocytosis of photosynthetic bacteria
in both cases by large anaerobic bacteria who would not otherwise be able to exist in an aerobic environment.
this arrangement became a mutually beneficial relationship for both cells (symbiotic).
Margulis' original hypothesis proposed that aerobic bacteria (that require oxygen) were ingested by anaerobic bacteria (poisoned by oxygen), and may each have had a survival advantage as long as they continued their partnership.
Chloroplasts cannot be made by the plant cell and must be inherited by each daughter cell during cell division.