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Broad vs Narrow Spectrum Drugs quiz

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  • What does the spectrum of an antimicrobial drug refer to?
    It refers to the range of microbes the drug is effective against.
  • What is a broad-spectrum antibiotic?
    A broad-spectrum antibiotic is toxic to many types of microbes, including both gram-positive and gram-negative bacteria.
  • What is a narrow-spectrum antibiotic?
    A narrow-spectrum antibiotic is toxic to only a few types of microbes, often targeting specific groups like gram-positive bacteria.
  • Why are the terms 'broad spectrum' and 'narrow spectrum' considered relative?
    Because no antibiotic kills all types of bacteria; the terms describe a range of effectiveness compared to other drugs.
  • What structural feature is characteristic of gram-positive bacteria?
    Gram-positive bacteria have a single membrane and a thick, exposed peptidoglycan cell wall.
  • What structural feature is characteristic of gram-negative bacteria?
    Gram-negative bacteria have a double membrane, with an outer membrane containing porins and a cell wall located between the membranes.
  • Why are narrow-spectrum drugs often more effective against gram-positive bacteria?
    Because gram-positive bacteria have an exposed cell wall and only one membrane, making them more accessible to these drugs.
  • Why is it harder for drugs to affect gram-negative bacteria?
    Gram-negative bacteria have two membranes, and drugs must pass through the outer membrane, often via porins, to reach their target.
  • What role do porins play in gram-negative bacteria?
    Porins are proteins in the outer membrane that allow water and some drugs to pass through into the cell.
  • How does the location of the cell wall in gram-negative bacteria affect drug effectiveness?
    The cell wall is located inside the outer membrane, making it less accessible to many antibiotics.
  • Can a narrow-spectrum drug ever target gram-negative bacteria?
    Yes, but it is less common; most narrow-spectrum drugs tend to target gram-positive bacteria.
  • What is a common pattern seen with narrow-spectrum antibiotics?
    They are often toxic to gram-positive cells only, due to easier access to the cell wall.
  • Why is understanding bacterial cell wall structure important for antibiotic selection?
    Because the structure determines how easily drugs can reach and affect the bacteria, influencing drug effectiveness.
  • What must most drugs do to affect gram-negative bacteria?
    They must pass through the outer membrane, usually via porins, to reach their target.
  • Is there any antibiotic that kills all types of bacteria?
    No, there is no antibiotic that is effective against all types of bacteria.