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Question

A certain antibiotic X is effective only against a few types of harmful microbes and cells. Which type of antibiotic X is ?.

A
antibacterial
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B
narrow-spectrum
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C
broad-spectrum
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D
limited spectrum
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Solution

The correct option is B narrow-spectrum
Antibiotics are classified based on the range of microbes that are affected by it.

The range of bacteria or other microorganisms that are affected by a certain antibiotic is expressed as its spectrum of action. Antibiotics which kill or inhibit a wide range of Gram-positive and Gram-negative bacteria are said to be broad spectrum antibiotics. Those effective mainly against Gram-positive or Gram-negative bacteria are narrow spectrum antibiotics. If effective against a single organism or disease, they are referred to as limited spectrum antibiotics.
Penicillin is an example of narrow-spectrum.

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