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A bacterium has been gram-stained. You look through the scope and see purple cells. This bacterium is therefore referred to as being _____.

Answer :

Final answer:

A bacterium has been gram-stained. You look through the scope and you see purple cells. This bacterium is therefore referred to as being Gram-positive bacterium.

Explanation:

The bacterium you're referring to is called a Gram-positive bacterium. After being Gram-stained, these bacteria retain a purple/violet stain when viewed under a microscope due to the presence of a thick layer of peptidoglycan in their cell wall which traps the crystal violet-iodine complexes during the staining procedure.

They are distinguished from Gram-negative bacteria, which appear red or pink after Gram staining due to a thinner peptidoglycan layer and an additional outer membrane. For example, Bacillus cereus is an example of a Gram-positive bacterium which appears violet after Gram staining while Escherichia coli is a Gram-negative bacteria that does not retain the violet stain but takes up the red counterstain.

Considerations should be made for older bacterial cells as damage to their cell walls may cause them to appear as gram-negative even though they may be gram-positive. Thus, it's important to use fresh bacterial cultures when Gram staining.

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Final answer:

In microbiology, the purple bacterium observed after a Gram stain is annotated as being Gram-positive, a categorization reflecting the high peptidoglycan content in its cell wall.

Explanation:

In the world of microbiology, bacteria can be categorized as either Gram-positive or Gram-negative through a method called the Gram stain. If a bacterium is observed to be purple after a Gram stain, it is referred to as being Gram-positive. This is due to the thick layer of peptidoglycan in the cell wall of Gram-positive bacteria that retains the crystal violet stain, resulting in the purple color.

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