During the G\(_0\) (G zero) phase of the cell cycle, what is the primary activity of the cell?

• A. The cell undergoes cytokinesis to produce two daughter cells.
• B. The cell exits the cycle and enters a quiescent state, performing normal functions without dividing.
• C. The cell synthesizes proteins required for chromosome condensation.
• D. The cell actively replicates its DNA in preparation for mitosis.

Answer: (B)

Verified step by step guidance

1. Understand the context of the cell cycle: The cell cycle consists of several phases, including G\(_1\), S, G\(_2\), and M phases, which are involved in cell growth, DNA replication, and division. The G\(_0\) phase is a specialized state outside of this cycle.
2. Recognize the role of the G\(_0\) phase: Cells in the G\(_0\) phase are not actively dividing. Instead, they exit the cell cycle and enter a quiescent state where they perform their normal functions, such as maintaining tissue structure or carrying out specialized tasks.
3. Differentiate G\(_0\) from other phases: Unlike the S phase (where DNA replication occurs) or the M phase (where mitosis and cytokinesis occur), the G\(_0\) phase is characterized by the absence of cell division activities.
4. Clarify the incorrect options: The cell does not undergo cytokinesis in G\(_0\), as it is not dividing. It also does not synthesize proteins for chromosome condensation or replicate DNA, as these activities are associated with other phases of the cell cycle.
5. Conclude the primary activity of the cell in G\(_0\): The cell remains in a quiescent state, performing its normal functions without preparing for division. This phase is common in differentiated cells, such as neurons or muscle cells, which do not frequently divide.