Examkin

Soru

Zorluk: ZorHealth, Nutrition, and Disease

A patient diagnosed with an acute influenza infection requests a prescription for amoxicillin, an antibiotic that specifically inhibits the synthesis of bacterial peptidoglycan cell walls. Which of the following best explains why this medication is ineffective against the patient's illness?

  1. A
    The pathogen is an intracellular bacterium that utilizes specialized efflux pumps to actively degrade cell wall-targeting antibiotics.
  2. Influenza is caused by a virus that lacks a peptidoglycan cell wall and relies entirely on host cellular machinery for replication.Cevap
  3. C
    Antibiotics selectively disrupt eukaryotic plasma membranes and cannot interact with non-enveloped viral glycoproteins.
  4. D
    The viral capsid contains chemically modified peptidoglycan cross-links that prevent antibiotic molecules from penetrating the genetic core.

Cevap

Influenza is caused by a virus that lacks a peptidoglycan cell wall and relies entirely on host cellular machinery for replication.
Influenza is caused by an orthomyxovirus, an acellular entity consisting of an RNA genome enclosed in a protein capsid and a lipid envelope. Because viruses do not synthesize peptidoglycan cell walls or carry out autonomous cell division, antibiotics like amoxicillin that inhibit cell wall biosynthesis have no molecular target and cannot treat viral infections.

Adım Adım Çözüm

1
Identify the biological classification of the pathogen causing the illness.
Influenza is caused by an influenza virus, which is an acellular viral pathogen rather than a bacterium.
Determining the pathogen type is essential for selecting appropriate pharmacological interventions.
2
Analyze the mechanism of action of the prescribed pharmaceutical agent.
Amoxicillin acts as a beta-lactam antibiotic that interferes with transpeptidation during bacterial peptidoglycan cell wall formation.
Understanding the drug target reveals which cellular components must be present for efficacy.
3
Evaluate the structural compatibility between the drug mechanism and the pathogen.
Viruses possess a protein capsid and an optional lipid envelope, but lack cell walls, peptidoglycan, and independent metabolic pathways.
Because the biochemical target of the drug is absent in viruses, the antibiotic cannot exert any therapeutic effect.

Anahtar Kavram

Pathogen Classification and Targeted Antimicrobial Mechanisms
Tahmini Süre:1m 15s
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Health, Nutrition, and Disease

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