Which group of bacteria are usually associated with human infections?
Psychrophiles
Thermophiles
Halophiles
Mesophiles
The Correct Answer is D
A. Psychrophiles: Psychrophiles grow best at very low temperatures (near 0–15°C) and are adapted to cold environments such as polar regions; they are not typically associated with infections in warm-blooded humans.
B. Thermophiles: Thermophiles prefer high temperatures (usually >45°C) and are commonly found in hot springs and geothermal sites; their temperature optimum is above human body temperature, so they rarely cause human infections.
C. Halophiles: Halophiles require or tolerate very high salt concentrations and are found in hypersaline environments (e.g., salt lakes); they are not commonly associated with human disease.
D. Mesophiles: Mesophiles grow best at moderate temperatures, typically between about 20–45°C, which overlaps human body temperature (≈37°C), making them the group most frequently associated with human infections.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Allosteric inhibition:
Allosteric inhibition involves a molecule binding at a site other than the active site to change enzyme activity; the described action is binding at the active site, so this does not match.
B. Competitive inhibition:
A competitive inhibitor resembles the substrate and competes for binding at the enzyme’s active site; binding prevents the actual substrate from occupying the active site, which fits the description of sulfanilamide.
C. Excitatory allosteric control:
This term implies activation via an allosteric site rather than inhibition at the active site and does not describe substrate mimicry binding the active site.
D. Noncompetitive inhibition:
Noncompetitive inhibitors bind at a different site and reduce enzyme activity regardless of substrate concentration; they do not typically resemble the substrate or compete for the active site.
E. Feedback inhibition:
Feedback inhibition occurs when an end product of a metabolic pathway inhibits an enzyme earlier in that pathway, usually via allosteric binding; the scenario describes direct active-site competition rather than pathway end-product regulation.
Correct Answer is D
Explanation
A. Are acellular: Subunit vaccines contain only parts of the pathogen, not the whole cell or organism, which reduces the risk of adverse reactions.
B. Are administered in food: Vaccines are generally not delivered through food; this does not contribute to their safety.
C. Do not pose a risk for causing the disease: Because they contain only specific antigens and no live pathogen, subunit vaccines cannot revert to a virulent form or cause infection.
D. Are acellular and do not pose a risk for causing the disease: Subunit vaccines are acellular and composed of purified antigens, making them both safer and incapable of causing disease.
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