Textbook Question
In the cells of some organisms, mitosis occurs without cytokinesis. This will result ina. cells with more than one nucleus.b. cells that are unusually small.c. cells lacking nuclei.d. cell cycles lacking an S phase.
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3. Energy & Cell Processes
Cell Cycle Regulation
Problem 19a
Textbook Question
Mark the following statements about the cell cycle as true or false. If a statement is false, correct it to make a true statement.
During the S phase of the cell cycle, the cell stalls until conditions for division are more favorable
Verified step by step guidance1
Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, and G2 phases) and the mitotic phase (M phase). The S phase is specifically responsible for DNA replication, not stalling for favorable conditions.
Analyze the statement: The statement claims that during the S phase, the cell stalls until conditions for division are more favorable. This is incorrect because the S phase is dedicated to DNA synthesis and replication, not stalling.
Correct the false statement: The corrected statement should be: 'During the S phase of the cell cycle, the cell replicates its DNA in preparation for cell division.'
Review the purpose of stalling in the cell cycle: Stalling typically occurs at checkpoints, such as the G1 checkpoint or G2 checkpoint, where the cell ensures conditions are favorable for division and checks for DNA damage.
Conclude the correction: The S phase is an active phase of DNA replication, and stalling for favorable conditions does not occur during this phase. Ensure understanding of the distinction between checkpoints and specific phases of the cell cycle.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cell Cycle Stages
The cell cycle consists of several stages, including G1, S, G2, and M phases. Each phase has specific functions, with the S phase being crucial for DNA replication. Understanding these stages helps clarify the processes that prepare a cell for division.
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S Phase Function
The S phase, or synthesis phase, is when a cell replicates its DNA, ensuring that each daughter cell receives an identical set of chromosomes. This phase is characterized by active DNA synthesis, not stalling, which is a common misconception.
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Cell Cycle Regulation
The cell cycle is tightly regulated by various checkpoints and proteins that ensure conditions are suitable for progression. If conditions are unfavorable, the cell may enter a resting state (G0) rather than stalling in the S phase, highlighting the importance of regulation in cell division.
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