Cell Division - Mitosis - in Whitefish Blastula Cells

 This cell is in the interphase stage of the cell cycle. Early in interphase the cell (A) reaches its full size and then starts preparing for its next division. Preparation includes chromosome replication, replication of cellular organelles, including centrioles, and the synthesis of microtublule units. Distinct chromosomes are not visible to the microscope at this time. But, the chromatin of the nucleus (B) appears prominent after staining. A nuclear envelope (C) encloses this region of the cell. Label the Interphase diagram: 1. nucleolus, 2. chromatin, 3. centrioles, 4. cell membrane, 5. nuclear envelope.

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