Which of the following substances would most effectively inhibit anaerobes?
a. Phenol
b. Silver
c. Ethanol
d. Hydrogen peroxide

Guida verificata passo dopo passo

Step 1: Understand the nature of anaerobes. Anaerobic microorganisms thrive in environments without oxygen and are often sensitive to substances that generate reactive oxygen species or disrupt their metabolic processes.

Step 2: Review the mode of action of each substance: Phenol disrupts cell membranes and denatures proteins; Silver ions interfere with microbial enzymes and DNA; Ethanol denatures proteins and dissolves lipids; Hydrogen peroxide produces reactive oxygen species that damage cellular components.

Step 3: Consider that anaerobes lack certain enzymes like catalase and superoxide dismutase, which protect against oxidative damage, making them particularly vulnerable to oxidative agents.

Step 4: Analyze which substance generates oxidative stress. Hydrogen peroxide decomposes to form reactive oxygen species, which are highly toxic to anaerobes due to their inability to neutralize these compounds effectively.

Step 5: Conclude that the substance producing reactive oxygen species (hydrogen peroxide) would most effectively inhibit anaerobic bacteria compared to the other options.

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Hyperthermophilic prokaryotes may remain viable in canned goods after commercial sterilization. Why is this situation not dangerous to consumers?

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Domanda del libro di testo

Which of the following types of radiation is more widely used as an antimicrobial technique?

a. Electron beams

b. Visible light waves