What does selective toxicity mean in antimicrobial pharmacology?

Selective toxicity means preferentially harming or inhibiting a microbial target while limiting harm to the host; the selectivity is relative rather than an assurance of no adverse effects.

Bacteriostatic effect Bactericidal effect

Key distinction · Inhibits bacterial growth in the stated conditions · Kills bacteria in the stated conditions

Beta-lactam wall synthesis

Beta-lactams inhibit bacterial cell-wall synthesis by interfering with penicillin-binding proteins, the transpeptidases involved in cross-linking peptide chains in newly synthesized peptidoglycan.

Selection of resistant microbes

Antimicrobial exposure favors microbes with heritable resistance: susceptible organisms are inhibited or killed while resistant organisms can survive and reproduce, so resistance becomes more common. Resistance can arise through spontaneous mutations or acquired resistance genes; this does not involve an organism intentionally choosing a mutation.

What cellular arrangement is characteristic of staphylococci in the introductory model?

Staphylococci are cocci that characteristically form irregular clusters; morphology alone does not establish a species-level diagnosis.

Flashcard deck

Microbiology — Flashcards

Microbiology50 cardsBeginnerEnglish

A flashcard deck with 50 cards in microbiology, made by Prognia.

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50 flashcards: 12 term-definition, 7 cloze, 22 classic-qa, 5 compare-contrast, 4 concept-explanation. Introductory microbiology practice contains 50 flashcards and 50 quizzes covering basic bacterial envelopes, intracellular structures and survival forms; representative bacterial morphologies and metabolic patterns; viral particles and phage/retroviral replication; fungal growth forms; protozoan and helminth organization; attachment and opportunism; biofilms; foundational antimicrobial target and selection principles; and microbial-control terminology. Evidence, concept links and 25 objectives support focused question-level feedback and recommendations. This initial set teaches stable textbook mechanisms, not comprehensive pathogen identification, clinical treatment selection or national infection-control protocols.