T. Clark Brelje, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
Robert L. Sorenson, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
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What are the two types of chromatin found in the nucleus? [+]
Heterochromatin - tightly packed form of DNA. Heterochromatic nuclei stain uniformly and intensely with hematoxylin. This is indicative of a cell with low transcriptional activity.
Euchromatin - lightly packed form of DNA. Euchromatic nuclei show random clumps of hematoxylin staining mostly at the periphery of the nucleus and the nucleolus. This is indicative of cells with high transcriptional activity.
Which component(s) of the nucleus stains intensely with basophilic dyes? [+]
Heterochromatin (DNA) and the nucleolus (RNA)
At high magnification, examine individual lymphocytes surrounding this capillary.