Why are positively charged basic dyes more effective in staining bacterial cells compared to negatively charged acidic dyes?

• A. Basic dyes are smaller molecules and can penetrate cell walls more easily.
• B. Positively charged basic dyes react chemically with the DNA of bacteria.
• C. Negatively charged acidic dyes dissolve in the bacterial cell membrane.
• D. Bacterial cells have negatively charged surfaces that attract positively charged basic dyes.

Answer: (D)