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Which of the following is a Gram-positive bacteria?

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Which of the following is a Gram-positive bacteria?

(a) Acetobacter aceti

(b) Escherichia coli

(c) Gluconobacter oxydans

(d) Streptococcus pneumoniae

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I would like to ask this question from Microbiology topic in division Yeast Management & Microbiology of Fermentation Technology

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The correct answer is (d) Streptococcus pneumoniae

For explanation: Streptococcus pneumoniae is a Gram-positive bacteria which take up purple stain from crystal violet when observed under the microscope. Other three bacteria belong to Gram-negative as they are observed as a pink stain when observed in the microscope.

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