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Why most you use deionized water rather than tap water in this experiment?
A- Tap water has many ions
B- Tap water has virus
C- tap water has pathogens
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- Which of the following prevented an aerotolerant anaerobic, mesophilic and halophilic bacterium from contaminating your home aquarium? the water was at 37ºC you placed a high amount of glucose into the aquarium you placed several pennies in the aquarium you were using a .45 um filtering unit you placed carbon dioxide instead of oxygen into the aquariumDoes the image above represent a pure culture? Yes O NoWhich of the following are true regarding UV disinfection? Mark all that apply. Water must be clear, so light can kill pathogens It is the cheapest method of disinfection The water has to flow at a specific speed past the UV light Only about 85% of pathogens are killed by UV It is very rarely used in water disinfection due to high costs
- Transformation of bacteria can be done via Electroporation Calcium chloride treatment, heat shock and then on ice Both options are possibilitiesThis diagram shows the filter paper method used to evaluate the inhibitory effect of chemical agents, heavy metals, and antibiotics on bacterial growth. A culture of a test bacterium is spread uniformly over the surface of an agar plate. Small filter paper discs containing the material to be tested are then placed on the surface of the medium. A disc that has been soaked in sterile distilled water is sometimes added as a control. After incubation, a lawn (film of growth) will cover the plate, but a clear zone will surround those discs that contain an inhibitory compound. The size of the zone reflects several factors, one of which is the effectiveness of the inhibitory agent. What are two other factors that might affect the size of the zone of inhibition? What is the purpose of the control disc? If a clear area were apparent around the control disc, how would you interpret the observation?Which of the following statements regarding low temperature storage is FALSE? Question options: freezing inhibits microbes through the unavailability of water freezing causes microbial death largely through DNA denaturation all of these statements are TRUE refrigeration functions largely by reducing the metabolic rate of microbes psychrophiles are generally not effectively inhibited by refrigeration many bacteria can survive freezing for years at a time
- I want the solution very quickly within 15 minutesIn disc diffusion studies, where will the lowest concentration of the tested chemical be in the agar plate? in the agar directly below the disc O in the agar halfway between the disc and the petri dish wall O in the agar furthest away from the disc the cehmical is equally distributed throughout the agarWhich is better for fish treatment Antibiotic or Probiotic? Why? Thank you very much for your help.
- Sewage works use microbes in many ways to break down organic matter. Which of the following processes is NOT carried out? Pathogenic bacteria and viruses are added to the input sewage as a tracer and to ensure the processes have all worked well Bacteria and archaea are used in sludge digesters to breakdown organic matter anaerobically Bacterial trickle filter beds have a wide variety of microbes to break down organic matter Activated sludge selects for Gram negative bacteria that break down wasteYou obtain a 1 mL sample of contaminated drinking water in order to calculate the number of fecal bacteria in the water. The 1 mL sample is diluted into a first bottle with 99 mL of sterile saline. One mL from the first bottle is transferred into a second bottle of saline containing 9 mL. Finally, 1 mL from the second bottle is transferred to a third bottle with 9 mL of saline. You create two spread plates from the third bottle: plating 0.1 mL results in 106 colonies, while plating 1 mL results in 562 colonies. How many fecal bacteria per mL are in the drinking water? This is a homework assignment, and I am struggling to do this correctly. Thanks for your help.Which of the following molecules have been used as a biomarker in studies in microbial ecology? a Sterols b All molecules have been used as a biomarker. c D-alanine d Tertahymanol