What is believed to be the concentration of bacteria in soil? 109-1010 cells/g dry weight 105-106 cells/g dry weight 10-2-10-3 cells/g dry weight 1010-1011 cells/g dry weight 10-9-10-10 cells/g dry weight
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- What is the word used to describe microbes which have simple enzyme systems and which require growth factors (e.g. vitamins, amino acids) to grow? Trouble Buffer Fastidious EasyThe followings list the false statements about microbial growth curves EXCEPT* Log phase indicates that microbes need to adjust to a new environment of food Microbes grow exponentially when they are in the stationary phase Microbes grow exponentially when the conditions of the food are favorable for multiplication O Microbes start to die when they are in the lag phase O Lag phase indicates that microbes does not have enough time to growAll of the following are ways microorganisms adapt to limited nutrients except: synthesize increased amount of enzymes for uptake and metabolism of limited nutrients form metabolically active highly resistant endospores synthesize enzymes needed to use a different nutrient acetic acid adjust the rate at which they metabolize nutrients
- %OM pH EC Ca2+ Mg2+ K+ Na+ Al3+ H+ % dS/m cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil cmolc/kg soil 2.7% 7.6 4.5 19 13 10 3 1 4 Is this soil affected? If so, what type? - saline - sodic - not salt affected - saline-sodicFor 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 °CIn New York, farmers typically have a 3 year crop rotation of corn – soybeans – green manure. A) explain one reason crop rotation is important in farming B) explain what green manure is and why a grower would use it as part of their rotation schedule
- There are various parameters to assess microbial growth. What are some microbial growth curve characteristics? Can you explain how microbiologists measure specifically bacteria growth?In simpler terms explain Lag, Log, Stationary, and Death Phase in the Microbial Growth Curve?4/variants/410004/take/12/ MULTIPLE CHOICE Question 18 Why are bacteria essential to the nitrogen cycle? Bacteria break down rocks to release nitrogen into the soil. B. Bacteria convert nitrogen gas into a form that living things can use. C. Bacteria attract animals to the plants they eat for food. D. Bacteria kill off weak plants by giving them diseases. MULTIPLE CHOICE Question 19 The diagram below depicts the phosphorus cycle. Which of the processes from the dia- gram releases phosphorus for living things to use? ed
- 1. Why is water activity important? 2. Do an online search to learn about four foods with low water activity. What organisms , if any. grow in these foods? 3. Do an online search to learn about four foods with high water activity. What organisms, any, grow in these foods? 4. go to https://www.metergroup.com/food/articles/microbial-growth/ What are the approximate water activity values of the organisms used in today's exercise? 5. List the media used in today's lab in order from that with the lowest water activity to that with the highest activity . On which do you expect to see growth of all the microbes ?Explain the concepts of TDT (Thermal Death Time) and TDP (Therma Death Point), and discuss one example of how these measurements can be modified to produce food for human consumption that is free of microbial contaminants yet still tasty. Use examples. What are the minimum TDTs for vegetative cells and endospores? Minimum of 500 wordsA bacteria colony's radius is measured as a function of time. t r(t) 0 1.01 0.1 1.031 Estimate the rate of growth Ar/At at t = 0.1 Give two digits past the decimal point. 0.2 1.052 0.3 1.074 0.4 1.096