Microbiology exam 1-FAU Exam Questions with Correct Answers

Microbiology exam 1-FAU Exam Questions with Correct Answers 5. List the benefits of microorganisms in helping to shape planet earth. - Answer-a. The production of oxygen by microbes allowed species diversification, some microbes are used in making antibiotics, cheese, beer, wine, bread, and gas productions. 6. How did the earth's atmosphere get majority of its oxygen? - Answer-a. Anoxygenic photosynthesis-70% of the earth's oxygen comes from photosynthetic microorganisms (mostly bacteria & algae) 7. How did Bacteria, Archaea and Eukarya evolve and when did representative cells from each group appeared on planet earth? - Answer-a. Bacteria, archaea, and eukarya arose from the last universal common ancestor LUCA, single celled organisms arose 3.5 billion years ago and were only living inhabitants until 2.9 billion years ago. 8. Compare and contrast the characteristics of Bacteria and Archaea? - Answer-a. Both are 10x smaller than eukaryotes, both lack organelles, both prokaryotes, archaea cell walls lack peptidoglycan, archaea have a more complex RNA polymerase similar to eukaryotes