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Microbiology Fundamentals from Tortora et al. (14th ed.)

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Termini in questo insieme (28)

  • What is microbiology?

    Microbiology is the study of microorganisms, including bacteria, viruses, fungi, protozoa, and algae.

  • What are microorganisms?

    Organisms too small to be seen clearly by the naked eye, including bacteria, viruses, fungi, protozoa, and microscopic algae.

  • What is the difference between prokaryotic and eukaryotic cells?

    Prokaryotic cells lack a nucleus and membrane-bound organelles; eukaryotic cells have a nucleus and organelles.

  • Name the three domains of life.

    The three domains are Bacteria, Archaea, and Eukarya.

  • What is the role of the cell wall in bacteria?

    The cell wall provides shape, protection, and prevents osmotic lysis in bacteria.

  • What is the Gram stain and its significance?

    The Gram stain differentiates bacteria into Gram-positive and Gram-negative based on cell wall structure.

  • Describe the structure of Gram-positive bacteria cell walls.

    Thick peptidoglycan layer with teichoic acids; retains crystal violet stain, appearing purple.

  • Describe the structure of Gram-negative bacteria cell walls.

    Thin peptidoglycan layer and outer membrane with lipopolysaccharides; does not retain crystal violet, appears pink/red.

  • What is the function of bacterial flagella?

    Flagella provide motility to bacteria, allowing movement toward or away from stimuli.

  • Define binary fission.

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

  • What are endospores?

    Endospores are dormant, resistant structures formed by some bacteria to survive harsh conditions.

  • What is the role of enzymes in microbial metabolism?

    Enzymes catalyze biochemical reactions, increasing reaction rates without being consumed.

  • Define aerobic and anaerobic respiration.

    Aerobic respiration uses oxygen as the final electron acceptor; anaerobic respiration uses other molecules.

  • What is fermentation?

    Fermentation is an anaerobic process that converts sugars into acids, gases, or alcohol to generate energy.

  • What is the significance of microbial genetics?

    Microbial genetics studies gene structure, function, and transfer, crucial for understanding mutation, resistance, and biotechnology.

  • What are plasmids?

    Plasmids are small, circular DNA molecules in bacteria that carry genes, often for antibiotic resistance.

  • Describe the process of transformation in bacteria.

    Transformation is the uptake of free DNA from the environment by a bacterial cell.

  • What is transduction?

    Transduction is gene transfer between bacteria via bacteriophages (viruses).

  • What is conjugation in bacteria?

    Conjugation is direct transfer of DNA between bacterial cells through a pilus.

  • What is the role of viruses in microbiology?

    Viruses are infectious agents that require host cells to replicate and can cause diseases in humans and other organisms.

  • Define the lytic and lysogenic cycles in bacteriophages.

    Lytic cycle results in host cell destruction; lysogenic cycle integrates viral DNA into host genome.

  • What are the main types of microscopy used in microbiology?

    Bright-field, dark-field, phase-contrast, fluorescence, and electron microscopy are key types for viewing microbes.

  • What is the importance of aseptic technique?

    Aseptic technique prevents contamination of cultures and the environment during microbiological work.

  • What is the role of normal microbiota?

    Normal microbiota are microbes that live on or in the body without causing disease and can protect against pathogens.

  • Define pathogenicity and virulence.

    Pathogenicity is the ability to cause disease; virulence is the degree of pathogenicity.

  • What are biofilms?

    Biofilms are communities of microorganisms attached to surfaces, embedded in a protective matrix.

  • What is the role of antibiotics in microbiology?

    Antibiotics are substances that kill or inhibit bacterial growth, used to treat infections.

  • What mechanisms do bacteria use to resist antibiotics?

    Bacteria resist antibiotics by enzymatic degradation, altering targets, efflux pumps, or preventing drug entry.