A Level Biology Practice Exam

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Master the A Level Biology Exam. Use flashcards and multiple choice questions with hints and explanations to ace your test. Start your journey to excellence!

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Which stage of mitosis is marked by the assembly of chromosomes at the poles?

Prophase
Metaphase
Telophase
Interphase

The correct answer is: Telophase

The correct choice is the one that corresponds to the stage in mitosis where chromosomes are assembling at the poles of the cell. During telophase, after the chromosomes have been separated and moved to opposite poles, they begin to de-condense back into chromatin, and the nuclear envelope re-forms around each set of chromosomes. This stage is characterized by the presence of two distinct sets of chromosomes at the poles of the cell. The other stages of mitosis involve different processes. Prophase is when the chromosomes condense and become visible, the mitotic spindle begins to form, and the nuclear membrane starts breaking down. Metaphase is defined by the alignment of chromosomes along the metaphase plate, and interphase is the phase of the cell cycle when the cell is not actively dividing and chromosomes are not yet visible.