The followings list the false statements about microbial growth curves EXCEPT Log phase indicates that microbes need to adjust to a new environment of food O Microbes grow exponentially when they are in the stationary phase Microbes grow exponentially when the conditions of the food are favorable for multiplication Microbes start to die when they are in the lag phase O Lag phase indicates that microbes does not have enough time to grow
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- According 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 enzymesWhich of the following statements regarding microbial death is FALSE? Question options: cell walls are targeted by many microbial control agents the effectiveness of an antibacterial agent is a funciton of its microbial death rate the rate at which microbes are killed is termed the microbial death rate all of these statements are TRUE few antimicrobial agents function through the disruption of protein structure under a given set of conditions, the fraction of a microbial population that dies per minute is typically constant over timeThe survival, growth and reproduction of microorganisms are influenced by physical and nutritional factors in its environment. Give the principle of microbial destruction/microbe population control behind making jam and jelly.
- Which of the following statements regarding microbial death is FALSE? Question options: cell walls are targeted by all microbial control agents all of these statements are TRUE many antimicrobial agents function through the disruption of protein structure under a given set of conditions, the fraction of a microbial population tht dies per minute is typically constant over time the effectiveness of an antibacterial agent is a function of its microbial death rate the rate at which microbes are killed is termed the microbial death rateThe survival, growth and reproduction of microorganisms are influenced by physical and nutritional factors in its environment. Give the principle of microbial destruction/microbe population control behind sunbathing sleeping mats and pillowsDuring 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
- Give a brief but critical discussion about microbial growth in natural environments and how it differs from the laboratory culturing of micro-organisms.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.Imagine yourself being assigned to a very poor, remote village to educate the people about sanitation and microbial control. What method of microbial destruction or microbe population control will you teach them in order to kill/destroy the microorganisms that may be found in: 1. the gallon of pond water collected for drinking
- Microorganism growth in complex natural environments such as soils and waters can be utilized to carry out environmental management processes. Give one term for the process you would use to cleanse a marine oil spill and discuss at least 3 types thereof. Outline factors that would facilitate the success of the process you mentioned on 1. Discuss the use of indicator organisms in testing the quality of drinking water.Explain the reasons why the Poon Choi is the high risk food for the elderly? It would be easily spoiled if you found the condensed water on the inner side of the cover lid of the container, and also if you put it at room temperature for more than two hours. Explain in term of the factors of microbes growth. Explain it in detailed.Microbial 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