Question

correct the ones marked wrong, and explain why they are the right answer

Part I. Multiple Choice. 1.5 points each, 32 questions, 48 points to Fill in the blank with the correct answer choice. 1. Which of the following is NOT required for microorganisms to grow and divide? ationefoliciningisson re edcorator als D replication b. binary fission um ormation injustt e@hours. This Cequatorial septum formation d. conjugation 2. A culture of Salmonella increases from 20 cells to over 10,000 cells in just three hours. This statement best represents a. lag phase. b. budding exponential growth. c. doubling time. 3. If a researcher starts with 14 organisms at time o, how many organisms will they have after 9 generations, assuming exponential a. 126 b. 512 7.168 d. 14,336 4. Which of the following is NOT happening during the lag phase of growth? a. Cells are at their largest. c. d. b Genes for growth in the specific environment are turned on Cell components are being synthesized Cells are detecting their environment. 5. When a microorganism is found in an environment below its minimum growth temperature, a) the cell dies. growth stops because the cell membrane melts. c. growth slows or stops because enzymatic processes become sluggish. d. growth slows but does not stop. soshaema o 6. A cteria is most likely to be a human pathogen. a mesophilic d. psychrophilic 7. Strict anaerobes die in the presence of oxygen because they are vulnerable to reactive oxygen species. are not able to get enough energy without using oxygen as a terminal electron acceptor. c. do not use oxygen as a terminal electron acceptor d. strict anaerobes do not die in the presence of oxygen. A facultative organism might prefer aerobic respiration over fermentation when carbohydrates become scarce because it gets 8. a. less energy from aerobic respiration. more energy from fermentation. C.more energy from aerobic respiration. facultative organisms never prefer aerobic respiration to fermentation. 9. Bacterial organisms form a biofilm to claim territory and fight off competing organisms of a different species. attach to a surface in an area where food is plentiful. find a food source when nutrients are scarce. mate with other bacterial organisms of the same or different species. c. d. 10. Enzymes increase reaction rates by a. increasing activation energies Cincreasing the concentration reactants b. decreasing activation energies d. f reactants. increasing the concentration of products. 10 Page 1 of 8

Answer 1

1. Conjugation - it is a process by which the genetic material is transferred from one cell to another.

4. Cells at their largest.

7. Are vulnerable to reactive oxygen species.

10. Decreasing activation energy - the lower the activation energy higher will be the rate.

14. Only heterotrophic organism require energy inputs to survive.

15. They are catalyzed by enzymes.

16. Mesophiles.