MacConkey lactose agar is a medium that kills all microbes except for gram-negative bacteria, and it contains dyes that turn deep purple if a microbe grows and ferments lactose. MacConkey lactose agar is which sort of medium? Selective and differential Selective Differential
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- Which of the following statements regarding microbial control agents is FALSE? Question options: strongly acidic or alkaline disinfectants are typically more effective than neutral pH agents the presence of extracellular fats typically decreases the effectiveness of control agents a warmed disinfectant is typically more effective than the same disinfectant at room temperature substances secreted by members of biofilms increase protection against microbial control agents all of these statements are TRUE bacterial endospores are more resistant to antimicrobial treatment than vegetative bacterial cellsWhen heat treatment is used as to control microbial growth, what is the immediate impact of this increased temperature? The microbe's DNA is digested and the microbe can no longer reproduce. The microbe is unable to attach to host cells. The microbe is unable to synthesize and secrete toxins. The microbe's food is destroyed and the microbe is without a food source. The microbe's proteins are denatured and the membranes are disrupted.A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the generation time of the species is 1 hour, and the microbes are in the exponential (log) phase of growth, how many hours require for the culture to surpass 10,000 cells/ml, if the culture is checked once each hour? O 1) 2 hours O 2) 7 hours O 3) 3 hours O 4) 10 hours O 5) 24 hours
- A microbe is growing on Sabouraud dextrose agar, which has a slightly acidic pH. Which of the following is this microbe likely to be? a Gram-negative bacterium an acid-fast bacterium a fungus a Gram-positive bacteriumIf lysozyme is added to a microbial culture. Predict what will be observed if the culture is affected by the action of lysozyme. A change in color will be visible in the tube. An increase in absorbance will be observed over time. A decrease in absorbance will be observed over time. An increase in turbidity will be observed over time.A microbiologist used the concept of enrichment culture to isolate aerobic and anaerobic nitrogen-fixing bacteria, sulfate-reducing bacteria, and sulfur-oxidizing bacteria. What kind of selective media could he haveused for isolating each of these four classes of microbes?
- In the laboratory, autoclaving is required to prepare media for the growth of microorganism. What type of method of control does this involve? Dry Heat Moist Heat Chemical Radiation All of the optionsIs the mannitol salt agar (MSA) a complex or defined medium? Explain based on Composition. What kind of media based on what kind of microorganisms it allows to growA broth culture is initially inoculated with a single bacterial cell. For the first hour the bacteria has a generation time of 30 minutes, for the second hour the generation time has been reduced to 15 minutes, and for the third hour the generation time has been reduced to 10 minutes. At the end of the third hour how many bacteria are present in the broth culture?
- Diseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilms can be more pathogenic.how is UV radiation a good type of control mechanism against microbial growth?please expalin what happens to the microbe and affects this control cause.Suppose you observed a bacterium growing on Mannitol Salt agar (MSA) with a yellow colony appearance in the clinical microbiology lab. Name the genus and species you are most likely observing; state its most likely oxygen needs and salt requirements; and predict if this organism would grow on MacConkey agar or Colistin Nalidixic Acid agar. If you want to control the growth of this organism in a healthcare setting, predict what disinfectants would be best to use and their modes of action. Explain your reasoning