Microbiology & Immunology

Q. What is the minimum inhibitory concentration (MIC) of a drug that inhibits 90% of a bacterial population at a concentration of 2 mg/L?
  • A. 1 mg/L
  • B. 2 mg/L
  • C. 3 mg/L
  • D. 4 mg/L
Q. What is the minimum temperature and time required for effective autoclaving?
  • A. 121°C for 15 minutes
  • B. 100°C for 30 minutes
  • C. 134°C for 10 minutes
  • D. 160°C for 1 hour
Q. What is the most effective method for sterilizing heat-sensitive medical instruments?
  • A. Autoclaving
  • B. Ethylene oxide gas
  • C. Boiling water
  • D. Hydrogen peroxide vapor
Q. What is the primary advantage of using hydrogen peroxide as a disinfectant?
  • A. It is non-toxic to humans
  • B. It leaves no residue
  • C. It is effective against spores
  • D. It is inexpensive
Q. What is the primary advantage of using UV light for disinfection?
  • A. It is effective against all pathogens
  • B. It does not leave chemical residues
  • C. It is inexpensive
  • D. It penetrates surfaces effectively
Q. What is the primary difference between disinfection and sterilization?
  • A. Disinfection kills all microorganisms, sterilization does not
  • B. Sterilization kills all microorganisms, disinfection does not
  • C. Disinfection is faster than sterilization
  • D. Sterilization is only for surgical instruments
Q. What is the primary disadvantage of using glutaraldehyde as a disinfectant?
  • A. It is ineffective against viruses
  • B. It requires long exposure times
  • C. It is corrosive to metals
  • D. It has a strong odor
Q. What is the primary disadvantage of using glutaraldehyde for disinfection?
  • A. It is ineffective against viruses
  • B. It requires long exposure times
  • C. It is corrosive to metals
  • D. It is not environmentally friendly
Q. What is the primary function of antibodies in the immune response?
  • A. To directly kill pathogens
  • B. To neutralize toxins
  • C. To enhance phagocytosis
  • D. To activate complement system
Q. What is the primary function of B cells in the immune response?
  • A. Phagocytosis of pathogens
  • B. Production of antibodies
  • C. Activation of T cells
  • D. Release of cytokines
Q. What is the primary function of neutrophils in the immune response?
  • A. Antibody production
  • B. Phagocytosis of pathogens
  • C. Activation of T cells
  • D. Release of histamine
Q. What is the primary function of T helper cells in the immune response?
  • A. Directly kill infected cells
  • B. Activate B cells and cytotoxic T cells
  • C. Produce antibodies
  • D. Phagocytize pathogens
Q. What is the primary function of the complement system in immunity?
  • A. Antibody production
  • B. Pathogen lysis and opsonization
  • C. T cell activation
  • D. Cytokine release
Q. What is the primary function of the complement system in the immune response?
  • A. To produce antibodies
  • B. To enhance phagocytosis
  • C. To directly lyse pathogens
  • D. To activate T cells
Q. What is the primary immune cell type involved in the response to viral infections?
  • A. B cells
  • B. T helper cells
  • C. Cytotoxic T cells
  • D. Macrophages
Q. What is the primary laboratory test used to diagnose streptococcal pharyngitis?
  • A. Blood culture
  • B. Rapid antigen detection test
  • C. Urinalysis
  • D. Chest X-ray
Q. What is the primary mechanism by which the influenza virus evades the immune system?
  • A. Antigenic drift
  • B. Phagocytosis
  • C. Complement activation
  • D. Lysis of host cells
Q. What is the primary mechanism by which vaccines provide immunity?
  • A. Inhibition of pathogen replication
  • B. Stimulation of the immune response
  • C. Direct destruction of pathogens
  • D. Blocking pathogen entry
Q. What is the primary mechanism of action for alcohol-based disinfectants?
  • A. Denaturation of proteins
  • B. Disruption of cell membranes
  • C. Inhibition of nucleic acid synthesis
  • D. Oxidation of cellular components
Q. What is the primary mechanism of action for chlorine as a disinfectant?
  • A. Protein denaturation
  • B. Nucleic acid synthesis inhibition
  • C. Cell wall disruption
  • D. Oxidation of cellular components
Q. What is the primary mechanism of action for chlorine-based disinfectants?
  • A. Protein denaturation
  • B. Nucleic acid synthesis inhibition
  • C. Cell wall disruption
  • D. Enzyme inhibition
Q. What is the primary mechanism of action for ethylene oxide in sterilization?
  • A. Denaturation of proteins
  • B. Disruption of cell membranes
  • C. Inhibition of nucleic acid synthesis
  • D. Oxidation of cellular components
Q. What is the primary mechanism of action for glutaraldehyde as a disinfectant?
  • A. Oxidation of cellular components
  • B. Denaturation of proteins
  • C. Disruption of nucleic acids
  • D. Inhibition of cell wall synthesis
Q. What is the primary mechanism of action for quaternary ammonium compounds as disinfectants?
  • A. Oxidation of cellular components
  • B. Disruption of cell membranes
  • C. Inhibition of protein synthesis
  • D. Interference with nucleic acid synthesis
Q. What is the primary mode of transmission for the hepatitis B virus?
  • A. Airborne
  • B. Fecal-oral
  • C. Bloodborne
  • D. Vector-borne
Q. What is the primary mode of transmission for the influenza virus?
  • A. Vector-borne
  • B. Airborne
  • C. Fecal-oral
  • D. Direct contact
Q. What is the primary purpose of sterilization in a clinical setting?
  • A. To reduce microbial load
  • B. To eliminate all forms of microbial life
  • C. To disinfect surfaces
  • D. To enhance immune response
Q. What is the primary purpose of sterilization in microbiology?
  • A. To reduce microbial load
  • B. To eliminate all forms of microbial life
  • C. To inhibit microbial growth
  • D. To enhance microbial growth
Q. What is the primary purpose of the complement system in immunity?
  • A. To produce antibodies
  • B. To enhance phagocytosis and lyse pathogens
  • C. To activate T cells
  • D. To stimulate B cells
Q. What is the primary purpose of using a biological indicator in sterilization processes?
  • A. To measure the temperature of the sterilizer
  • B. To confirm the presence of pathogens
  • C. To verify the effectiveness of the sterilization process
  • D. To assess the chemical composition of the sterilant
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