Gram-positive and Gram-negative bacteria are distinguished by
AThe number of chromosomes per cell
BThe geometric shape of the bacterial cell
CThe response to the Gram staining procedure
DThe presence or absence of ribosomes
Answer & Solution
Correct answer: C. The response to the Gram staining procedure
Differential staining devised by Christian Gram (1884). Differences in cell-wall peptidoglycan thickness and the presence of an outer membrane in Gram-negatives produce the colour difference. NCERT 8.4.1 cites the Gram stain explicitly.
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