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Secondary metabolites of microbes are formed during the
phase of growth.
a. exponential b. stationary c. lag d. death
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- What is the difference in microbial population from water sediment and neustonic source? A. Ratio of phototrophic and heterotrophic microbes. B. Ratio of anaerobic microbes to aerobic microbes. C. Ratio of heterotrophic and cellulolytic microbes. D. All statements are acceptable descriptions.Which of the following events is NOT a common among microbes in the air? A. Exposure to UV light. B. Relocated due to updrafts. C. Cellular death due to desiccation. D. Decrease is population due to competition.During the ____________________ phase of microbial population growth, the rate of cell division begins to slow down or division stops entirely. a. stationary b. lag c. death d. exponental growth
- (a) Increasing the number of microorganisms in a composting system through inoculum addition, hastens the decomposition process; (b) The heating of the compost pile up to thermophilic levels destroys weed seeds and kills plant pathogenic microorganisms A. If statement A is true B. if statement B is true C. both statement A and B are true D. statement A nor B are trueBacteria that thrive in puncture wounds are likely to be (a) aerobes (b) photoautotrophs (c) chemoautotrophs (d) endospores (e) obligate anaerobesMicrobial growth is measured by what parameter?(a) Increased cell size(b) Increased size of cellular components(c) Increase in total number of cells(d) b and c(e) a and b
- A microbe causing a bloodstream infection is likely all of the following except A. A chemotroph B. A parasite C. A heterotroph D. A thermophileAccording to the Liebig's Law of Minimum, which condition of certain growth factor limits growth of microorganisms? * A. factor in abundance B. factor in optimal C. factor in minimum D. factor in maximum 2. Growth is best when microbes are incubated at ______ level within its tolerance range. * A. minimum B. maximum C. optimum D. magnanimous 3. At what phase of microbial growth when microbial growth and reproduction is fastest? * A. death phase B. log phase C. lag phase D. stationary phase 4. Most human pathogens are ______ with regard to temperature range of tolerance for optimum growth. * A. thermophiles B. mesophiles C. psychrophiles D. xerophiles 5. Which adaptations are developed by thermophiles to withstand extremely high temperature? Check all that apply. * ( ) high proportion of unsaturated fatty acids in the cell membrane ( ) high cytosine-guanine nitrogenous bases ( ) more saturated fatty acids in cytoplasmic membrane ( ) heat-stable enzymesOn what basis were both Shigella and Salmonella eliminated aspossible causes of the outbreak pathogen?a. Gram reaction b. fermentation of glucose c. oxidase results d. motility
- In your own words, explain the factors that influence the growth of microorganisms.Chlorinating swimming pools is an example of______________ to control microbial populations. A. employing halogens B. employing heavy metals C. employing surfactantsFor long-term storage of microbes that will be may be revived and grown later, what temperatures are best? Group of answer choices between -2 and 4 °C above 70 °C between -10 to -20 °C below -70 °C