All of the following can achieve sterilization (killing endospores, but not prions) EXCEPT gamma radiation O autoclaving at 121 C for 25 min, 15 psi O x ray radiation O boiling water to 100 C for 30 minutes O dry heat at 180 C for 2-4 hours
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- Question 5 You spread a small amount of a water sample from the environment on an enriched media agar plate. After 24 hours, the plate is covered with many small yellow colonies. Does this plate contain a pure culture of bacteria? ○ No, because it came from the environment, there are lots of different organisms. ○ We know there are multiple species present, but each colony is a different species. ○ Yes, we know the plate contains a pure culture because there are individual colonies. ○ We do not know if the plate contains a pure culture or a mixed culture. or even if individual colonies are pure or mixed based on their appearance alone.Question 7 Microbiology BIOL 2420 What does the line at the end of the arrow represent? Question 7 options: a) therapeutic index of the antibiotic b) minimum inhibitory concentration c) end of diffusion of the antibiotic d) more than one of theseQuestion 5  Antibiotic resistance might be assumed if 1. bacterial colonies are present on a streptomycin negative plate 2. bacterial colonies are present on a streptomycin positive plate 3. bacterial colonies are absent on a streptomycin negative plate 4. bacterial colonies are absent on a streptomycin positive plate
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- Question 26 A ___ is an even layer of bacteria on an agar plate. a progenitor cell b bacterial lawn c Kirby-Bauer test d colonyQuestion 14 Which of the following terms refers to specific procedures used to prevent unwanted microorganisms from contaminating the clinical specimen? Question 14 options: a) Needle aspiration b) Catheterization c) Disinfectant technique d) Aseptic techniqueQuestion 16 Within the context of infectious disease, which of the following specimens would be considered irretrievable? Question 16 options: a) Wound swab b) Blood sample for therapeutic drug monitoring c) Cerebrospinal fluid d) Urine sample