Important characteristic(s) of antimicrobic drugs include
All of these choices are correct.
do not cause serious side effects in humans.
remains active in body tissues and fluids.
readily delivered to the site of infection.
high toxicity against microbial cells.
The Correct Answer is A
A. All of these choices are correct: Effective antimicrobial drugs must meet several important pharmacologic and microbiologic criteria to ensure therapeutic success. These include selective toxicity toward microbial cells, minimal harmful effects on human tissues, the ability to remain active in body fluids and tissues, and the capacity to reach the site of infection in effective concentrations. Each listed characteristic contributes to the effectiveness and safety of therapy.
B. do not cause serious side effects in humans: One of the essential principles of antimicrobial therapy is selective toxicity, meaning the drug targets microbial structures or metabolic pathways while minimizing harm to host cells. Antimicrobials should produce manageable adverse effects so that treatment can proceed without causing significant injury to the patient.
C. remains active in body tissues and fluids: For an antimicrobial to be effective, it must maintain adequate stability and activity within physiological environments such as blood, tissues, and extracellular fluids. Drugs that remain stable and active in the body are better able to sustain antimicrobial activity against pathogens.
D. readily delivered to the site of infection: Antimicrobial agents must be capable of reaching the infected tissues in sufficient concentrations to inhibit or destroy the pathogen. Barriers such as poor blood supply and tissue inflammation can limit drug delivery. Effective drugs are able to penetrate these tissues or are administered in ways that ensure adequate distribution.
E. high toxicity against microbial cells: Antimicrobial drugs should exert strong inhibitory or lethal effects on microorganisms by targeting structures such as bacterial cell walls, ribosomes, nucleic acids, or metabolic pathways. Selective toxicity allows pathogens to be eliminated while host cells remain largely unaffected. This is characteristic of effective antimicrobial therapy.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. log phase: The log phase, or exponential phase, is characterized by rapid, logarithmic growth of bacteria. During this period, the rate of cell division exceeds the rate of cell death, resulting in a steep increase in population size. Nutrients are abundant, and waste products have not yet accumulated to inhibitory levels.
B. lag phase: The lag phase is the initial period after bacteria are introduced into a new environment. During this phase, cells are metabolically active but not dividing, as they adapt to the new conditions, synthesize necessary enzymes, and prepare for active growth.
C. telophase: Telophase is a stage of eukaryotic mitosis, not a bacterial growth phase. Bacteria reproduce via binary fission, so this term does not apply to the bacterial growth curve.
D. stationary phase: The stationary phase occurs when nutrient depletion and waste accumulation slow microbial growth. During this phase, the rate of cell division equals the rate of cell death, resulting in a plateau in population size. This phase reflects environmental stress and triggers survival mechanisms in bacteria.
E. death phase: The death phase follows the stationary phase when the rate of cell death exceeds the rate of new cell formation. The bacterial population declines due to exhaustion of nutrients and accumulation of toxic byproducts.
Correct Answer is C
Explanation
A. chlorination: Chlorination is effective for disinfecting water and some surfaces but is not suitable for beverages like milk, juice, or wine. Chlorine can leave undesirable tastes and chemical residues, making it impractical for liquid foods intended for consumption.
B. boiling water: Boiling can destroy many vegetative microorganisms but may not eliminate heat-resistant spores and can negatively affect the flavor, texture, or nutritional quality of beverages. It is less controlled than pasteurization for commercial beverage safety.
C. pasteurization: Pasteurization is the preferred method for disinfecting beverages. It uses controlled heat (typically below 100°C) for a specific time to kill pathogenic microorganisms and reduce spoilage organisms without significantly altering taste or nutritional value. Milk, juice, and wine are commonly treated with this method to ensure safety and extend shelf life.
D. moist heat autoclave: Autoclaving sterilizes liquids and equipment at high temperature and pressure, destroying all microbial life including spores. While effective, it is too harsh for beverages, as it can cause changes in flavor, color, and nutrient content.
E. filtration: Filtration can physically remove microorganisms, including bacteria and yeast, from liquids. While it is useful for certain beverages like beer or wine, it is less practical for fluids with high particulate content and does not achieve the controlled microbial reduction provided by pasteurization.
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