MICROBIOLOGY CHAPTER 6 TEST BANK QUSTIONS AND ANSWERS

MICROBIOLOGY CHAPTER 6 TEST BANK QUSTIONS AND ANSWERS Micrococci are facultative halophiles. In Figure 6.1, which line best depicts the growth of M. luteus in a nutrient medium containing 7.5% NaCl? A) a B) b C) c - correct answers -B The addition of which of the following to a culture medium will neutralize acids? A) Buffers B) Sugars C) pH D) Heat E) Carbon - correct answers -Buffers Salts and sugars work to preserve foods by creating a A) Depletion of nutrients. B) Hypotonic environment. C) Lower osmotic pressure. D) Hypertonic environment. E) Lower pH. - correct answers -Hypertonic environment The term facultative anaerobe refers to an organism that A) Doesnʹt use oxygen but tolerates it. B) Is killed by oxygen. C) Uses oxygen or grows without oxygen. D) Requires less oxygen than is present in air. E) Prefers to grow without oxygen. - correct answers -Uses oxygen or grows without oxygen Which of the following is not a disadvantage of the standard plate count? A) Cells may form aggregates. B) Requires incubation time. C) Determines viable cells. D) Chemical and physical requirements are determined by media and incubation. E) None of the above. - correct answers -Determines viable cells Which of the following is not a disadvantage of the direct microscopic count? A) Some organisms are motile. B) Enumerates dead cells. C) No incubation time. D) Sample volume is unknown. E) Large number of cells is required. - correct answers -Sample volume is unknown Which of the following is not used to determine metabolic activity? A) Acid production from fermentation.