In lab, a student observes some dull, wrinkled brown colonies growing on their agar. They Gram stain the sample and observe single bacilli. Their blood agar does not reveal any hemolysis while their MSA has growth and fermentation. Using the following table and the given observations, determine which microorganism this would most likely be.Bacilli B. cereus B. subtilis Colony morphology Dull, frosted colonies Dull, wrinkled colonies cream to brown colors Microscopic arrangement Chains Single bacilli Catalase + + Blood agar Beta Gamma Mannitol salt agar - + growth and + fermentation Pseudomonas P. aeruginosa Catalase + Oxidase + Motile + Blood agar Beta Glucose fermentation + Escherichia E. coli Lactose fermentation + Motile + Citrate
fermentation - Urease - Catalase +
A. E. coli
B. B. subtilis
C. Pseudomonas aeruginosa
D. B. cereus
Answer: B
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