Question

what are the names of the two groups of bacteria resulting from the gram stain method?
a) gram - positive and gram - negative
b) gram - visible and gram - invisible
c) gram - cocci and gram - rods
d) gram - variable and gram - constant

Explanation:

The Gram - stain method is a common technique in microbiology. Bacteria are classified based on their cell - wall properties. Gram - positive bacteria retain the crystal violet stain (appear purple) due to a thick peptidoglycan layer in their cell walls. Gram - negative bacteria lose the crystal violet stain during the decolorization step (appear pink/red after counter - staining) because they have a thin peptidoglycan layer and an outer membrane. Options b, c, and d are incorrect as they are not the standard classifications from the Gram - stain method.

Answer:

A. Gram - positive and Gram - negative