Basic dyes have a positive charge.

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Multiple Choice

Basic dyes have a positive charge.

Explanation:
Basic dyes carry a positive charge, which makes them attracted to negatively charged cellular components such as DNA and RNA in the nucleus. This ionic attraction is why these dyes stain basophilic structures, producing blue/purple nuclei in routine stains like hematoxylin. If a dye is negatively charged or neutral, it wouldn’t preferentially bind to those nuclear constituents in the same way. Acidic dyes, in contrast, are negatively charged and bind to positively charged structures (like cytoplasm and extracellular proteins), giving a different staining pattern. So the defining trait of basic dyes is their positive charge.

Basic dyes carry a positive charge, which makes them attracted to negatively charged cellular components such as DNA and RNA in the nucleus. This ionic attraction is why these dyes stain basophilic structures, producing blue/purple nuclei in routine stains like hematoxylin. If a dye is negatively charged or neutral, it wouldn’t preferentially bind to those nuclear constituents in the same way. Acidic dyes, in contrast, are negatively charged and bind to positively charged structures (like cytoplasm and extracellular proteins), giving a different staining pattern. So the defining trait of basic dyes is their positive charge.

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