Question

Name the scientist who devised Gram's stain? Give briefly its principle and
procedure. Name three gram positive and three gram negative bacteria.

07 Aug 2026
Answer :
Word Count : 109
Gram staining was devised by the Danish bacteriologist Hans Christian Gram in 1884. Its principle is based on differences in bacterial cell-wall structure. Gram-positive bacteria possess a thick peptidoglycan layer and retain the crystal violet–iodine complex, appearing purple. Gram-negative
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