True or False: When bacteria exist in a multi species biofilms, they are always more resistant to antibiotics than when they exist as a single species population.
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- Bacterial growth depends on many environmental factors, including the temperature of the environment. Since microbes can survive in a certain range of temperatures and will thrive at a temperature, understanding these variables allows for control of their growth. This understanding can be used, for example, to preserve certain foods or to treat infections. This lab simulation will use an instrument called a spectrophotometer. This instrument quantitatively measures the amount of light that is absorbed or transmitted by molecules in solution. Microbial populations grow at different rates based on temperature. One way to measure growth is by turbidity measurements. When bacteria multiply in a broth culture they turn the clear solution cloudy, or turbid. a) in your own words explain the proper steps to Inoculate 5°C sterile broth tube using aseptic techniqueDiscuss biofilms and their relevance to infectious diseases. Discuss population growth and the phases of a typical bacterial growth curve. Describe generation time for a bacterial population Explain how bacterial growth correlates to disease. Describe how environmental changes can alter the shape of a growth curve. Categorize microbes based on their preferred environmental niches (pH, temperature, oxygen and salt). Identify the biological properties that allow different classes of microbes to grow in extreme environments.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.
- In stages of bacterial growth, this is the phase where the bacterium adjusts to the new environment and the start of biosynthesis although increase in cell mass is not evident. Question options: Period of Rejuvenescence Log Phase Plateau Phase Exponential PhaseIt is the period wherein the bacteria is sensitive to radiation and antimicrobial agents. Question options: Exponential Phase Decline Phase Lag Phase Stationary PhaseWhich 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 cells
- Diseases that involve biofilm-producing bacteria are serious concern. They are not easily treated compared with those involving free-floating bacteria. Explain three reasons why biofilm formers are more pathogenic.True or False: An isolated bacterial colony supplies cells to grow a "pure culture" of the bacteria. True FalseDescribe the importance of the nitrogen and carbon cycles and the role of microbes in their maintenance. Discuss biofilms and their relevance to infectious diseases. Discuss population growth and the phases of a typical bacterial growth curve. Describe generation time for a bacterial population Explain how bacterial growth correlates to disease. Describe how environmental changes can alter the shape of a growth curve. Categorize microbes based on their preferred environmental niches (pH, temperature, oxygen and salt). Identify the biological properties that allow different classes of microbes to grow in extreme environments.
- True or False Exposure of bacterial cells to antibiotics: 50s is disrupted 60s is disrupted 80s is normal sturdy cell wallWhat is the best explanation for why a bacteriostatic treatment might be chosen over a bacteriocidal treatment? Bacteriostatic treatments will eliminate all bacteria while bacteriocidal treatments will only eliminate a portion of the bacteria. Bacteriostatic treatments typically have lower toxicity to the host when compared to bacteriocidal treatments. Bacteriostatic treatments will prevent all bacterial growth, while bacteriocidal treatments will permit some bacterial growth. Bacteriostatic treatments are typically more costly than bacteriocidal treatments.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 biofilm formers are more pathogenic. Brian goes to the hospital after not feeling well for a week. He has a fever of 38 °C (100.4 °F) and complains of nausea and a constant migraine. Distinguish between the signs and symptoms of disease in Brian’s case.