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You are observing a Gram stain of spherical-shaped microorganisms that are linked in a chain and stain purple. How would you describe these bacteria using the correct terminology for the cell shape and arrangement?

a) gram-positive tetrads
b) gram-positive coccobacilli
c) gram-positive streptococci
d) gram-negative staphylococci

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Answer:

The correct answer is option c) "gram-positive streptococci".

Explanation:

Gram-positive bacteria are stained purple by crystal violet coloration, result of the cell wall interaction with the dye. On the other hand, streptococci are spherical-shaped microorganisms linked in a chain or a raw, which also are gram-positive. Therefore, the correct terminology of the bacteria observed in the laboratory will be a gram-positive streptococci.

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