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Which of these phases includes all of the stages of mitosis but no other events?

A. G1 phase
B. S phase
C. M phase
D. G2 phase

1 Answer

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Final answer:

The correct phase that includes all of mitosis but no other events is the M phase. Interphase, comprised of G1, S, and G2, deals with cell growth and DNA duplication; whereas, the M phase includes mitosis (prophase, prometaphase, metaphase, anaphase, and telophase) and cytokinesis without any increase in cell size during the S phase.

Step-by-step explanation:

The student's question pertains to the phase of the cell cycle that includes all of the stages of mitosis but no other events. The correct answer to this question is C. M phase. This phase is distinct from interphase, which is comprised of three other stages: the G1 phase, S phase, and G2 phase. These interphase stages involve cell growth, DNA replication, and preparation for cell division. The M phase, however, encompasses both mitosis and cytokinesis, where mitosis includes prophase, prometaphase, metaphase, anaphase, telophase, and is followed by cytokinesis, the division of the cytoplasm.

To answer the question regarding which of the following events does not occur during some stages of interphase, it is important to understand what happens during each stage. During the G1 phase of interphase, the cell grows and accumulates the necessary energy reserves and building blocks for chromosomal DNA replication. The S phase is primarily for the synthesis of DNA or DNA duplication.

Finally, in the G2 phase, the cell undergoes final preparations for cell division. There is no increase in cell size during the S phase as it focuses exclusively on DNA replication. Therefore, the correct answer is "b. increase in cell size" for an event that does not occur during some stages of interphase.

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