Please answer all questions
Which of the following would be appropriate to use as anantiseptic?
A. Ethanol
B. Ultraviolet light
C. Bleach
D. Phenol
If a piece of heat-sensitive medical equipment must be sterileto be used, which of the following methods would be the best methodto achieve this?
Autoclaving
Ionizing radiation
Ultraviolet light
Bleach
An antimicrobial substance that works by disrupting the plasmamembrane would be ineffective in treating infections caused by:
Enveloped animal viruses
Prions
Yeast
Gram-positive bacteria
What is the primary mechanism by which ionizing radiation killsmicroorganisms?
Disruption of the plasma membrane
Damage to genetic material
Inhibition of cellular respiration
Denaturing proteins
A food scientist is trying to calculate how long bagged saladshould be exposed to ionizing radiation to reduce the microbialpopulation to 10 or fewer cells. Based on population estimates, theaverage bag of salad has 10,000,000,000 (ten billion) bacterialcells before treatment. The scientist knows that exposure toionizing radiation kills 99.9% of the cells in 5 seconds. What isthe minimum amount of time the scientist expose each bag of saladto radiation to be sure that there are 10 or fewer living cells inthe package?
10 seconds
15 seconds
5 seconds
20 seconds
Based on the cellular structure of Mycobacteriumtuberculosis, which of the following disinfectants would bebest to use to prevent its growth?
Group of answer choices
Benzalkonium chloride
Phenol
Iodine
Silver nitrate
Which of the following methods of controlling microbial growthis bacteriostatic?
Oligodynamic action
Alcohol
Boiling
Refrigeration
Select all that apply!
Which of the methods of microbial control listed below arebiocidal?
Phenol
Ethanol
Hydrogen peroxide
Filtration
Ultraviolet light
Desiccation
Several media types contain heat-sensitive ingredients,including the urease broth used to determine if an organism candigest urea. To use urease media, it must be sterile beforeinoculation. What is the best way to create sterile ureasebroth?
Filter the media
Include antibiotics in the media
Autoclave the media
Add formaldehyde to the broth
