9. Some microbial eukaryotes, such as Giardia , lack mitochondria. When this was
ID: 56613 • Letter: 9
Question
9.Some microbial eukaryotes, such as Giardia, lack mitochondria. When this was first discovered, it was thought that these lineages could represent the earliest diverging eukaryotes. Given that the symbiosis with alpha-proteobacteria happened only one time in Eukarya, what is another possible explanation for the lack of mitochondria in Giardia?
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10.You will learn in lecture that the chloroplast is the result of an endosymbiosis between a eukaryotic cell and a cyanobacterium. Just like with mitochondria, this happened only one time in the Plantae lineage. However, several microbial eukaryotes not related to Plantaehave chloroplasts. What is a possible explanation for this?
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Explanation / Answer
9.It is suspected that Giardia must have come into existence even before mitochondira started to live in a symbiotic association inside host cells.This could confirm the fact that Giardia would be some one billion years old during which mitochondria had not yet started to live in symbiosis within host cell.Some other researchers also suggest that Giardia possesed mitochondria but eventually lost it in the process of evolution that took place millions of yeras ago.
10.Secondary endosymbiosis could be the possible reason during which a live cell engulfs an eukaryote cell which has undergone primary endosymbiosis,thus resulting in several microbial eukaryotes.
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