MCB 2289Module 5 quiz with answers

Module 5 quiz  Question 1 The slowed growth or lack of growth of an organism at temperatures of pH outside of its ideal range is most likely due to changes in its ________? Selected Answer: Enzymes Answers: Enzymes Cell wall Capsule Bacterial chromosome  Question 2 A hypotonic solution is one with a solute concentration greater than that of a cell. Selected Answer: Fals e Answers: True Fals e  Question 3 A hypertonic solution is prepared by the addition of sucrose. Which of the following would happen to bacteria placed in this solution: Selected Answer: The bacterial cells will undergo plasmolysis Answers: The bacterial cells will swell, but not lyse There will be no change in the bacterial cells The bacterial cells will undergo osmotic lysis The bacterial cells will undergo plasmolysis  Question 4 Where would you expect an obligate anaerobe to grow in a nutrient broth tube? Selected Answer: Lower part of the tube This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseHAnswers: Upper part of the tube Lower part of the tube Throughout the tube Middle part of the tube  Question 5 The term aerobic, anaerobic, and microaerophilic are used to categorize microorganisms based on their ______ requirements. Selected Answer: oxygen Answers: oxygen temperature carbon dioxide pH  Question 6 Distilled water would be _______ to bacterial cells: Selected Answer: Hypotonic Answers: Isotonic Hypotonic Hypertonic  Question 7 All of the following are environmental factors that affect microbial growth EXCEPT Selected Answer: cell wall type Answers: temperature osmotic pressure pH This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseHll wall type  Question 8 Most human pathogens are classified as thermophiles. Selected Answer: Fals e Answers: True Fals e  Question 9 Human skin provides an environment with NaCl levels slightly above that of most bacterial cells. Which organism would most likely be found on the skin? Selected Answer: A halotolerant organism Answers: A halotolerant organism An organism that does not tolerate hypertonic salt conditions very well An obligate anaerobe A psychrophile  Question 10 Atmospheric gases, nutrients, pH, energy sources and radiation are all examples of ______ factors that affect microbial growth Selected Answer: environmental Answers: chemical inhibitory biotic environmental  Question 11 A solution with a pH of 7 is acidic. Selected Answer: Fals This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseH Answers: True Fals e  Question 12 An organism that has an optimal pH for growth below 5.5 is considered an acidophile Selected Answer: Tru e Answers: Tru e False  Question 13 A microorganism will grow across the range of pH that allows for normal enzymatic function Selected Answer: Tru e Answers: Tru e False  Question 14 An organism that is unable to grow in the presence of atmospheric levels of gaseous oxygen, but needs a small amount of oxygen for its metabolism is called a __________________? Selected Answer: Microaerophile Answers: Microaerophile Obligate aerobe Facultative anaerobe Aerotolerant anaerobe  Question 15 All of these terms categorize microorganisms based on their temperature preference EXCEPT which? Selected Answer: Microaerophile This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseHAnswers: Thermophile Microaerophile Mesophile Psychrophile  Question 16 The changes or breakdown of three dimensional proteins that may result from a pH outside of an organism's growth range is referred to as ______________ Selected Answer: Denaturation Answers: Elongation Denaturation Annealing Degradation  Question 17 Which of the following would be used to provide the optimum growth temperature for microorganisms that typically grow in humans? Selected Answer: 37 degree C incubator Answers: Refrigerator Freezer 37 degree C incubator 72 degree C incubator  Question 18 All microorganisms use oxygen in their metabolism Selected Answer: Fals e Answers: True Fals e This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseH Question 19 The ideal environment for microbial growth would be: Selected Answer: Warm, isotonic, neutral pH Answers: Warm, hypertonic, neutral pH Cool, hypertonic, acidic pH Warm, hypotonic, neutral pH Warm, isotonic, neutral pH  Question 20 All of the following organisms are expected to grow within an anaerobe jar EXCEPT Selected Answer: Obligate aerobe Answers: Obligate anaerobe Aerotolerant anaerobe Obligate aerobe Facultative anaerobe Friday, May 3, 2019 3:17:21 PM CDT OK This study source was downloaded by from CourseH on :20:59 GMT -05:00 This study resource was shared via CourseH Powered by TCPDF ()