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D) Swan-neck flask experiment
Which contribution of Louis Pasteur directly led to the development of aseptic technique?
A) Germ theory of disease
B) Pasteurization
C) Discovery of anaerobes
D) Swan-neck flask experiment
C) Pasteur's swan-neck flask
A researcher claims that bacteria arose spontaneously in a nutrient broth left uncovered. Which historical experiment most directly refutes this claim while controlling for air exposure?
A) Redi's meat experiment
B) Needham's boiled broth
C) Pasteur's swan-neck flask
D) Koch's pure culture isolation
C) Antibiotic resistance
Plasmids are clinically significant because they frequently encode:
A) Structural proteins
B) Housekeeping genes
C) Antibiotic resistance
D) Metabolic enzymes only
B) Siderophores
Iron uptake is facilitated by compounds called:
A) Chelators
B) Siderophores
C) Porins
D) Catalases
B) Mosquito-malaria
Which is an example of biological transmission?
A) Housefly-cholera
B) Mosquito-malaria
C) Fomite-influenza
D) Droplet-TB
C) Botulinum toxin
Which of the following toxins causes flaccid paralysis?
A) Tetanospasmin
B) Diphtheria toxin
C) Botulinum toxin
D) Choleragen
B) Voriconazole
The drug of choice for invasive aspergillosis is:
A) Nystatin
B) Voriconazole
C) Ketoconazole
D) Griseofulvin