Which Organisms Stain as Either Gram-Positive or Gram-Negative

Question

Which organisms stain as either Gram-positive or Gram-negative?
A) Bacteria
B) Archaea
C) Eukarya

Accepted Answer

The Gram stain is a method used to differentiate bacterial species into two large groups: Gram-positive and Gram-negative, based on the physical properties of their cell walls. This technique does not apply to Archaea or Eukarya, as their cell structures are significantly different from those of bacteria.