The blue cytoplasmic staining indicates the presence of which organelle?

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Multiple Choice

The blue cytoplasmic staining indicates the presence of which organelle?

Explanation:
Basophilic staining of the cytoplasm points to areas rich in RNA. The rough endoplasmic reticulum is studded with ribosomes, which contain a lot of ribosomal RNA. That RNA binds basic dyes (like hematoxylin) and gives the cytoplasm a blue, basophilic appearance, especially around the nucleus where RER is most prominent. So the blue cytoplasmic staining indicates the presence of rough endoplasmic reticulum. The nucleus can stain blue too, but the clue here is cytoplasmic staining, not nuclear. Mitochondria and chloroplasts don’t produce this characteristic blue cytoplasmic basophilia in standard light microscopy.

Basophilic staining of the cytoplasm points to areas rich in RNA. The rough endoplasmic reticulum is studded with ribosomes, which contain a lot of ribosomal RNA. That RNA binds basic dyes (like hematoxylin) and gives the cytoplasm a blue, basophilic appearance, especially around the nucleus where RER is most prominent. So the blue cytoplasmic staining indicates the presence of rough endoplasmic reticulum. The nucleus can stain blue too, but the clue here is cytoplasmic staining, not nuclear. Mitochondria and chloroplasts don’t produce this characteristic blue cytoplasmic basophilia in standard light microscopy.

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