Which step in the Gram stain is the critical step in differentiating gram-positive cells from gram-negative cells?
A. safranin
B. alcohol-acetone
C. iodine
D. crystal violet
Answer:B
Which step in the Gram stain is the critical step in differentiating gram-positive cells from gram-negative cells?
A. safranin B. alcohol-acetone C. iodine D. crystal violet