13.3.3b Microorganism Disease Prevention and Treatment (MCQ-Hard)

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Question 1 of 5

1. Question
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A laboratory technician needs to sterilize a culture medium that contains heat-sensitive vitamins. Why would they choose chemical sterilization with formaldehyde over autoclaving?
- Chemicals are the only method capable of killing bacterial spores.
- High heat and pressure can denature or destroy the chemical structure of sensitive nutrients.
- Formaldehyde is safer for the technician to handle than a pressurized autoclave.
- Chemicals work faster than the standard 15-minute autoclave cycle.
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Question 2 of 5

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In a study of environmental factors, Bacillus sp. bacteria are placed in a medium with a pH of 4.5. Based on typical microbial preferences, what is the most likely outcome?
- The bacteria will grow at an accelerated rate due to the acidity.
- Growth will be inhibited because the acidic environment denatures essential bacterial enzymes.
- The bacteria will convert into yeast to survive the low pH.
- The pH will have no effect because Bacillus sp. are indifferent to acidity.
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Question 3 of 5

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Why do antivirals like Acyclovir focus on inhibiting viral multiplication rather than directly ‘killing’ the virus like some antibiotics kill bacteria?
- Viruses are non-living entities that lack the cellular machinery required for 'death' in the traditional sense.
- Antivirals are designed to be weaker than antibiotics to protect human cells.
- Viruses have thick cell walls that prevent chemicals from entering.
- Antivirals only work if the patient's body temperature is significantly raised.
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Question 4 of 5

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Gamma radiation is used to sterilize pre-packaged medical syringes. What is the primary mechanism that makes this form of radiation effective for this specific task?
- It creates a layer of heat that melts the cell walls of pathogens.
- It uses ionizing energy to penetrate packaging and directly destroy the genetic material of pathogens.
- It turns the air inside the packaging into a toxic gas like formaldehyde.
- It makes the plastic of the syringe radioactive to prevent future growth.
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Question 5 of 5

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If an antibiotic sensitivity test results in zero clear zones around any of the discs, including the high-concentration disc, what conclusion can be drawn about the bacterial culture?
- The bacteria used in the culture are actually fungi.
- The culture has developed total resistance to the specific antibiotic being tested.
- The agar used was too nutritious, allowing the bacteria to overcome the drug.
- The clear zone is present but is invisible to the human eye.
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13.3.3b Microorganism Disease Prevention and Treatment (MCQ-Hard)

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