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Q: In histology and cytology, which biological stain is used to color all cell nuclei red ?
  • A. Cresol Red
  • B. Phenolphthalein
  • C. Safranin
  • D. Methyl Orange
Correct Answer: Option C - Safranin, also known as Safranin O or basic red 2, is a biological stain used in histology and cytology. It is a cationic dye that binds to various tissue and cell components .Safranin has an affinity for acidic components such as nucleic acids in the cell nuclei. When applied to a sample, it binds to these components, staining them a distinct red colour.
C. Safranin, also known as Safranin O or basic red 2, is a biological stain used in histology and cytology. It is a cationic dye that binds to various tissue and cell components .Safranin has an affinity for acidic components such as nucleic acids in the cell nuclei. When applied to a sample, it binds to these components, staining them a distinct red colour.

Explanations:

Safranin, also known as Safranin O or basic red 2, is a biological stain used in histology and cytology. It is a cationic dye that binds to various tissue and cell components .Safranin has an affinity for acidic components such as nucleic acids in the cell nuclei. When applied to a sample, it binds to these components, staining them a distinct red colour.