1. Despite what this article says, almost all of the Archaea have a cell wall; it's just different in chemical details from the Bacterial cell wall. Why, in one sentence, is the loss of the cell wall described as "catastrophic"? What possibilities (again, in one sentence) did this catastrophe open up?
2. Bacteria and Archaea, as we have seen, tend to have genomes that are as small as possible and contain no excess baggage. Eukaryotes, on the other hand, have much larger genomes. How did mitosis make it possible to have really big genomes (two sentences)?
3. Describe one piece of evidence for the idea that mitochondria in each one of your cells are descended from free-living bacteria. (two sentences)