Why is Phenol red being utilized in MacConkey agar? Choose among the choices and further explain it. A. Inhibit microscopic organisms B. Detect the production of gas by-products C. Conduct the sulfate reduction test D. Detect the acid reaction of lactose fermentation
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Why is Phenol red being utilized in MacConkey agar? Choose among the choices and further explain it.
A. Inhibit microscopic organisms
B. Detect the production of gas by-products
C. Conduct the sulfate reduction test
D. Detect the acid reaction of lactose fermentation
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Solved in 2 steps
- Microorganisms are used in the production of a wide variety of fermented products. a) Using an example of a fermented product, explain the role of microorganisms in the production of this product. b) Explain why it is very important to control the quantity of food sources that these microbes metabolize?Describe what the plate in each scenario looks like: A. Bacteria grows on mannitol salt agar and is negative for mannitol fermentation B. Bacteria grows on EMB agar and is positive for lactose fermentation C. Bacteria grows on MacConkey agar and is negative for lactose fermentationIf you streak a sample from your nose onto a Mannitol salt agar plate and the medium turns yellow, what does that tell you? (choose all that apply) a. The organism is a yeast b. The organism ferments mannitol c. The organism is beta-hemolytic d. The organism is likely Staphylococus aureus e. The organism is acid tolerant
- A sharp growth line in the SIM media is an indication of what characteristic? A) Hydrogen sulfide gas production B) Tryptophan breakdown C) Indole production D) Non-motileDescribe the industrial fermentation process of Cephalosporin by including the type of fermentation porcess (batch, fed-batch or Continous) and bioreactor used. Also describe how the media was prepared.Which of the following are secondary metabolites: pyruvate, a secreted amylase, an antibiotic, leucine? What kind of system (fermenter vs. chemostat) would most likely be used for the production of the streptomycete antibiotic streptomycin? Explain your answer.
- Your nasal sample showed colonies with a clear halo around them on blood agar. What can you determine based on that observation? a. The organism is a mannitol fermenter b. The organism is able to utilize starch c. The organism is reducing the hemoglobin and damaging the erythrocytes d. The organism is beta-hemolytic e. The organism is unable to use red blood cells as a nutrient sourceYou plate 3 different strains of the bacteria family Aspergillis on a MacConkey Agar plate. You notice that 2 have a yellow shade, 1 has a subtle pink color. Please interpret this information. Such as, the type of fermenters these bacteria are and what this says about their metabolism. What does the color change represent? And how is this color change possible?If the result of an unknown bacteria is “poor growth” and “red growth,” can this result be interpreted as “organism does not ferment mannitol?” Explain why or why not. If the result of an unknown bacteria is “good growth” and “yellow growth,” is the unknown bacteria more likely Staphylococcus aureus or Staphylococcus epidermidis?
- Assume you are the lead industrial microbiologist in a company that produces cholesterol-lowering fungal metabolite such as lovastatin. Your team isolated a novel fungus that can be used for large-scale production of lovastatin. Briefly describe how you would produce 20 L of this product from a potato dextrose agar plate culture using a 20 L fermentor.give one reason why is it necessary to keep stirring the agar medium mixture in a beaker when heating in a hotplate?what does a negative result mean in an oxidase test?Select all that applies a)The bacteria may undergo anaerobic respiration b)The bacteria may have a cytochrome C oxidase c)The bacteria may undergo aerobic respiration d)The bacteria will not have cytochrome C oxidase e)None of the anwers are correct