A cell that passes the restriction point in G1 will most likely

Options

A. undergo chromosome duplication
B. have just have completed cytokinesis
C. continue to divide only if it is a cancer cell
D. show a drop in MPF concentration

Answer

To answer the question "A cell that passes the restriction point in G1 will most likely," we need to analyze the cell cycle and the implications of passing the restriction point (also known as the G1 checkpoint).

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). The restriction point in G1 is a critical checkpoint that determines whether a cell will proceed to the S phase.

2. **Role of the Restriction Point**: If a cell passes the restriction point in G1, it is committed to entering the S phase. This means that the cell is preparing to replicate its DNA.

3. **Consequences of Passing the Restriction Point**:
- **Chromosome Duplication**: Once the cell enters the S phase, it will undergo DNA replication, leading to chromosome duplication. This is a key event in the cell cycle.
- **Cytokinesis**: Cytokinesis occurs after mitosis (M phase), not during G1 or S phase. Therefore, passing the restriction point does not mean the cell has just completed cytokinesis.
- **Cancer Cells**: While cancer cells may continue to divide uncontrollably, normal cells that pass the restriction point will also divide. Thus, this statement is not exclusive to cancer cells.
- **MPF Concentration**: Maturation Promoting Factor (MPF) is involved in the regulation of the cell cycle. After passing the restriction point, MPF levels typically increase, not decrease.

4. **Conclusion**: The most likely outcome for a cell that passes the restriction point in G1 is that it will undergo chromosome duplication during the S phase.

### Final Answer:
A cell that passes the restriction point in G1 will most likely undergo chromosome duplication.

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