Which phase of mitosis is characterized by chromosomes becoming visible, the nuclear envelope dissolving, and spindle apparatus forming?

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Prepare for the ECPI Anatomy and Physiology AandP Exam 1. Utilize multiple choice questions and flashcards with detailed explanations. Enhance your knowledge and be exam-ready!

Multiple Choice

Which phase of mitosis is characterized by chromosomes becoming visible, the nuclear envelope dissolving, and spindle apparatus forming?

Explanation:
Understanding early mitosis: chromosomes condense and become visible under the microscope, the nuclear envelope breaks down, and the spindle apparatus forms to capture the chromosomes. This combination of events occurs during prophase, making it the best match for the description. In the later stages, different events happen: metaphase sees chromosomes align at the cell’s equator with spindle fibers attached; anaphase pulls sister chromatids apart toward opposite poles; and telophase re-forms the nuclear envelope around the separated chromosomes, with de-condensation occurring.

Understanding early mitosis: chromosomes condense and become visible under the microscope, the nuclear envelope breaks down, and the spindle apparatus forms to capture the chromosomes. This combination of events occurs during prophase, making it the best match for the description.

In the later stages, different events happen: metaphase sees chromosomes align at the cell’s equator with spindle fibers attached; anaphase pulls sister chromatids apart toward opposite poles; and telophase re-forms the nuclear envelope around the separated chromosomes, with de-condensation occurring.

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