Final answer:
The stage with condensed chromosomes in mitosis is called prophase, where chromatin becomes tightly wound into visible chromosomes, the nuclear envelope disintegrates, and the nucleolus disappears. The stage with unpacking of chromosomes and formation of new nuclear envelopes is called telophase, which marks the completion of mitosis.
Step-by-step explanation:
The question you're asking about is related to mitosis, a process of cell division in eukaryotic cells. Specifically, you're referring to the stage where the chromosomes have condensed but the active transport state has not yet been mentioned. This description matches the stage known as prophase, which is the first phase of mitosis. During prophase, the chromatin, which is the loose combination of DNA and proteins, condenses into visible chromosomes. Each chromosome becomes visible with its identical partner, or sister chromatid, attached, forming an X-shaped structure. Additionally, the nuclear envelope breaks down, and the nucleolus disappears.
In contrast, the stage characterized by the unpacking of chromosomes and the formation of a new nuclear envelope, as mentioned in the original question, is telophase. In telophase, the chromosomes reach the opposite poles of the cell, begin to decondense back into a less tightly wound chromatin state, and new nuclear envelopes form around each set of chromosomes at each pole, signifying the end of mitosis.