Question

A technician who is adding dye to a tissue specimen is most likely trying to determine whether the bacteria are a. Harmful or harmless B. Gram-positive or gram-negative C. Aerobic or anaerobic D. Round a rod-shaped

Answer 1

B. Gram-positive or gram-negative.
Gram positive bacteria stains DARK PURPLE because it retains the primary dye (crystal violet) in the cell wall, while Gram negative bacteria stains RED because it retains the counter staining dye (safranin).