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Microbiology: Microbial Growth, Control, and Antimicrobial Therapy

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Termini in questo insieme (20)

  • What are the four phases of microbial growth in culture?

    The four phases are lag phase, log (exponential) phase, stationary phase, and death phase.

  • Define sterilization, disinfection, and antisepsis.

    Sterilization removes all microbes; disinfection reduces microbes on surfaces; antisepsis reduces microbes on living tissue.

  • Name three physical methods of microbial control.

    Heat (boiling, autoclaving), filtration (removes microbes from liquids/air), and radiation (damages microbial DNA).

  • List four chemical agents used for microbial control.

    Alcohols, halogens (bleach, iodine), phenolics, and quaternary ammonium compounds.

  • What factors affect the effectiveness of antimicrobial control methods?

    Number of microbes, environmental conditions (temperature, pH), type of microbe, and time of exposure.

  • Describe binary fission in microorganisms.

    Binary fission is an asexual reproduction process where one cell divides into two identical daughter cells.

  • What environmental factors influence microbial growth?

    Temperature, pH, and oxygen availability are key environmental factors affecting growth.

  • How do antimicrobial drugs inhibit microbial growth? Name five mechanisms.

    By inhibiting cell wall synthesis, disrupting cell membranes, blocking protein synthesis, interfering with DNA/RNA synthesis, and inhibiting metabolic pathways.

  • What is the difference between broad-spectrum and narrow-spectrum antibiotics?

    Broad-spectrum antibiotics affect many types of bacteria; narrow-spectrum target specific bacteria.

  • How do microbes develop antibiotic resistance?

    Through mutation, gene transfer, and overuse or misuse of antibiotics.

  • Why is understanding microbial growth important in clinical and public health settings?

    It helps explain infection spread, microbial survival, and guides effective microbial control and treatment.

  • What is the role of enzymes in microbial metabolism?

    Enzymes catalyze biochemical reactions essential for microbial growth and energy production.

  • Name two methods used to measure microbial growth.

    Measuring turbidity (optical density) and plate counts (colony forming units).

  • What is the significance of the microbial growth curve?

    It illustrates the phases of growth and helps understand microbial population dynamics over time.

  • Explain how heat controls microbial growth.

    Heat kills microbes by denaturing proteins and disrupting membranes; autoclaving is the most effective heat method.

  • What is the Kirby-Bauer test used for?

    It is a drug sensitivity test to measure antimicrobial effectiveness against bacteria.

  • How does radiation control microbial growth?

    Radiation damages microbial DNA, preventing replication and causing cell death.

  • Why is microbial resistance a major global health concern?

    Because resistant microbes reduce the effectiveness of treatments, leading to harder-to-treat infections.

  • What are quaternary ammonium compounds used for?

    They are chemical disinfectants used to reduce microbial contamination on surfaces.

  • How do environmental conditions like pH affect microbial control?

    pH can influence the activity of antimicrobial agents and microbial survival.