Bacteria stain as gram- positive or gram- negative because of differences in the cell
A) wall.
B) nucleus.
C) chromosome.
D) cytoplasm.

Question

Quizplus · Accepted Answer

Bacteria stain as gram-positive or gram-negative based on the structure of their cell walls. Gram-positive bacteria have a thicker layer of peptidoglycan in their cell walls, which retains the crystal violet stain used in Gram staining, and appear purple under a microscope. Gram-negative bacteria have a thinner layer of peptidoglycan and an outer membrane that contains lipopolysaccharides, which makes it difficult for the crystal violet to penetrate the cell wall. Gram-negative bacteria will take up the counterstain, safranin, and appear pink under the microscope. The nucleus and chromosome, and cytoplasm of bacteria are not directly involved in Gram staining.

Bacteria Stain as Gram- Positive or Gram- Negative Because of Differences