06-clicker-questions.pptx

PowerPoint® Clicker Questions prepared by Bradley W. Christian, McLennan Community College CHAPTER 6 Microbial Growth © 2016 Pearson Education, Ltd. The optimum pH for MOST bacteria is near a) b) c) d) 1. 5. 7. 9. © 2016 Pearson Education, Ltd. The optimum pH for MOST bacteria is near a) b) c) d) 1....

PowerPoint® Clicker Questions prepared by Bradley W. Christian, McLennan Community College CHAPTER 6 Microbial Growth © 2016 Pearson Education, Ltd. The optimum pH for MOST bacteria is near a) b) c) d) 1. 5. 7. 9. © 2016 Pearson Education, Ltd. The optimum pH for MOST bacteria is near a) b) c) d) 1. 5. 7. 9. © 2016 Pearson Education, Ltd. A psychrophile has an optimal growth temperature of about a) b) c) d) 15°C. 25°C. 37°C. 100°C. © 2016 Pearson Education, Ltd. A psychrophile has an optimal growth temperature of about a) b) c) d) 15°C. 25°C. 37°C. 100°C. © 2016 Pearson Education, Ltd. Organisms that require high salt concentrations for growth are called a) b) c) d) thermophiles. obligate halophiles. acidophiles. anaerobes. © 2016 Pearson Education, Ltd. Organisms that require high salt concentrations for growth are called a) b) c) d) thermophiles. obligate halophiles. acidophiles. anaerobes. © 2016 Pearson Education, Ltd. What is/are the energy source(s) utilized by primary producers in the hydrothermal vents on the ocean floor? a) b) c) d) light hydrogen sulfide organic molecules carbon dioxide © 2016 Pearson Education, Ltd. What is/are the energy source(s) utilized by primary producers in the hydrothermal vents on the ocean floor? a) b) c) d) light hydrogen sulfide organic molecules carbon dioxide © 2016 Pearson Education, Ltd. Addition of salts preserves foods because they a) b) c) d) lower pH. increase osmotic pressure. create an isotonic environment. lower osmotic pressure. © 2016 Pearson Education, Ltd. Addition of salts preserves foods because they a) b) c) d) lower pH. increase osmotic pressure. create an isotonic environment. lower osmotic pressure. © 2016 Pearson Education, Ltd. Chemoautotrophs and photoautotrophs derive their carbon from a) b) c) d) carbon dioxide. proteins. lipids. carbohydrates. © 2016 Pearson Education, Ltd. Chemoautotrophs and photoautotrophs derive their carbon from a) b) c) d) carbon dioxide. proteins. lipids. carbohydrates. © 2016 Pearson Education, Ltd. Some microorganisms use gaseous nitrogen directly from the atmosphere in a process called a) b) c) d) denitrification. photosynthesis. nitrogen fixation. nitrogen synthesis. © 2016 Pearson Education, Ltd. Some microorganisms use gaseous nitrogen directly from the atmosphere in a process called a) b) c) d) denitrification. photosynthesis. nitrogen fixation. nitrogen synthesis. © 2016 Pearson Education, Ltd. An organism that uses oxygen when present but can grow without oxygen is called a(n) a) b) c) d) obligate aerobe. facultative anaerobe. microaerophile. aerotolerant anaerobe. © 2016 Pearson Education, Ltd. An organism that uses oxygen when present but can grow without oxygen is called a(n) a) b) c) d) obligate aerobe. facultative anaerobe. microaerophile. aerotolerant anaerobe. © 2016 Pearson Education, Ltd. Which organism is killed by atmospheric oxygen? a) b) c) d) facultative anaerobe obligate aerobe obligate anaerobe aerotolerant anaerobe © 2016 Pearson Education, Ltd. Which organism is killed by atmospheric oxygen? a) b) c) d) facultative anaerobe obligate aerobe obligate anaerobe aerotolerant anaerobe © 2016 Pearson Education, Ltd. Toxic hydrogen peroxide in some bacteria can be broken down into water and oxygen by the enzyme a) b) c) d) superoxide dismutase. peroxidase. hydroxylase. catalase. © 2016 Pearson Education, Ltd. Toxic hydrogen peroxide in some bacteria can be broken down into water and oxygen by the enzyme a) b) c) d) superoxide dismutase. peroxidase. hydroxylase. catalase. © 2016 Pearson Education, Ltd. Generation time can best be defined as a) b) c) d) the length of time it takes for lag phase. the duration of log phase. the time it takes for a cell to divide. how many generations a cell can divide. © 2016 Pearson Education, Ltd. Generation time can best be defined as a) b) c) d) the length of time it takes for lag phase. the duration of log phase. the time it takes for a cell to divide. how many generations a cell can divide. © 2016 Pearson Education, Ltd. Bacterial growth is usually graphed using ________ scales. a) b) c) d) arithmetic exponential logarithmic (semi-logarithmic) inverse © 2016 Pearson Education, Ltd. Bacterial growth is usually graphed using ________ scales. a) b) c) d) arithmetic exponential logarithmic (semi-logarithmic) inverse © 2016 Pearson Education, Ltd. In which growth phase is there intense activity preparing for population growth, but no increase in population? a) b) c) d) stationary phase log phase death phase lag phase © 2016 Pearson Education, Ltd. In which growth phase is there intense activity preparing for population growth, but no increase in population? a) b) c) d) stationary phase log phase death phase lag phase © 2016 Pearson Education, Ltd. Which of the following is NOT a possible reason why exponential growth stops? a) b) c) d) accumulation of waste products exhaustion of nutrients harmful changes in pH bacteria becoming dormant © 2016 Pearson Education, Ltd. Which of the following is NOT a possible reason why exponential growth stops? a) b) c) d) accumulation of waste products exhaustion of nutrients harmful changes in pH bacteria becoming dormant © 2016 Pearson Education, Ltd. In the stationary phase, a) the number of microbial deaths exceeds the number of new cells formed. b) the number of microbial deaths is equal to the number of new cells formed. c) new cells are no longer formed because of adverse environmental conditions. d) cellular reproduction is most active. © 2016 Pearson Education, Ltd. In the stationary phase, a) the number of microbial deaths exceeds the number of new cells formed. b) the number of microbial deaths is equal to the number of new cells formed. c) new cells are no longer formed because of adverse environmental conditions. d) cellular reproduction is most active. © 2016 Pearson Education, Ltd. Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes? a) b) c) d) differential media complex media selective media enrichment media © 2016 Pearson Education, Ltd. Which type of medium suppresses the growth of unwanted bacteria and encourages growth of desired microbes? a) b) c) d) differential media complex media selective media enrichment media © 2016 Pearson Education, Ltd. Microbes that are introduced into a culture medium to initiate growth are called a(n) a) b) c) d) inoculum. culture. specimen. medium. © 2016 Pearson Education, Ltd. Microbes that are introduced into a culture medium to initiate growth are called a(n) a) b) c) d) inoculum. culture. specimen. medium. © 2016 Pearson Education, Ltd. What is added to a medium when it is desirable to grow bacteria on a solid medium? a) b) c) d) glucose magnesium sulfate sodium thioglycollate agar © 2016 Pearson Education, Ltd. What is added to a medium when it is desirable to grow bacteria on a solid medium? a) b) c) d) glucose magnesium sulfate sodium thioglycollate agar © 2016 Pearson Education, Ltd. A culture medium made of extracts from yeasts, meat, or plants is a ________ medium. a) b) c) d) complex selective differential chemically defined © 2016 Pearson Education, Ltd. A culture medium made of extracts from yeasts, meat, or plants is a ________ medium. a) b) c) d) complex selective differential chemically defined © 2016 Pearson Education, Ltd. Labs intended for highly infectious airborne pathogens, such as tuberculosis, are classified as a) b) c) d) BSL-1. BSL-2. BSL-3. BSL-4. © 2016 Pearson Education, Ltd. Labs intended for highly infectious airborne pathogens, such as tuberculosis, are classified as a) b) c) d) BSL-1. BSL-2. BSL-3. BSL-4. © 2016 Pearson Education, Ltd. A spectrophotometer can be used to measure a) b) c) d) metabolic activity. turbidity. dry weight. pathogenicity. © 2016 Pearson Education, Ltd. A spectrophotometer can be used to measure a) b) c) d) metabolic activity. turbidity. dry weight. pathogenicity. © 2016 Pearson Education, Ltd. The method in which a measured volume of bacterial suspension is placed within a defined area on a microscope slide is called the a) b) c) d) direct microscope count. pour plate method. spread plate method. most probable number method. © 2016 Pearson Education, Ltd. The method in which a measured volume of bacterial suspension is placed within a defined area on a microscope slide is called the a) b) c) d) direct microscope count. pour plate method. spread plate method. most probable number method. © 2016 Pearson Education, Ltd. Which process is used to ensure that plates contain 30 to 300 colonies when counted? a) b) c) d) turbidity serial dilution filtration pour plates © 2016 Pearson Education, Ltd. Which process is used to ensure that plates contain 30 to 300 colonies when counted? a) b) c) d) turbidity serial dilution filtration pour plates © 2016 Pearson Education, Ltd. Which is the best technique to use to measure the growth of filamentous organisms? a) b) c) d) most probable number method direct microscopic count turbidity dry weight © 2016 Pearson Education, Ltd. Which is the best technique to use to measure the growth of filamentous organisms? a) b) c) d) most probable number method direct microscopic count turbidity dry weight © 2016 Pearson Education, Ltd. Which method is a statistical estimating technique used to determine the number of bacteria in a sample? a) b) c) d) turbidity spread plate method most probable number method pour plate method © 2016 Pearson Education, Ltd. Which method is a statistical estimating technique used to determine the number of bacteria in a sample? a) b) c) d) turbidity spread plate method most probable number method pour plate method © 2016 Pearson Education, Ltd. Starting with one bacterial cell, how many cells would you have after 10 generations? a) b) c) d) 10 20 200 1024 © 2016 Pearson Education, Ltd. Starting with one bacterial cell, how many cells would you have after 10 generations? a) b) c) d) 10 20 200 1024 © 2016 Pearson Education, Ltd.