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

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

(a) broad-spectrum

(b) narrow spectrum

(c) limited spectrum

(d) antibacterial

The question was asked in exam.

This intriguing question comes from Therapeutic Action of Different Classes of Drugs topic in portion Chemistry in Everyday Life of Chemistry – Class 12

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Correct option is (b) narrow spectrum

The explanation is: Antibiotics are classified based on the range of microbes that are affected by it. Broad spectrum antibiotics affect Gram-positive as well as Gram-negative bacteria. Narrow spectrum are used only against either Gram-positive or Gram-negative bacteria, whereas limited spectrum antibiotics kill or inhibit only one particular organism.

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