A) Escherichia coli
B) Bacillus subtilis
C) Streptomyces coelicolor
D) Ampycolatopsis orientalis
Correct Answer: A
Solution :
The Gram stain is named after the developer Christian Gram. About 75% of known bacteria are Gram negative, eg. Salmonella, Pseudomonas, Vibrio, Helicobacter, Haemophilus, Escherichia.
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