During cell cycle, every chromosome contains two DNA molecules from

Options

A. `G_(1)`-subphase to Anaphase
B. `G_(2)`-subphase to Anaphase
C. S-subphase to Metaphase
D. S-subphase to Anaphase

Answer

### Step-by-Step Solution:

1. **Understanding the Cell Cycle Phases**: The cell cycle consists of several phases: G1, S, G2, and M (mitosis). Each phase has specific functions and characteristics.

2. **Identifying DNA Replication**: During the S phase (Synthesis phase), DNA replication occurs. Each chromosome is duplicated, resulting in two identical DNA molecules (sister chromatids) for each chromosome.

3. **Analyzing the G1 Phase**: In the G1 phase (Gap 1), the cell grows and prepares for DNA synthesis. However, no DNA replication occurs in this phase, so each chromosome contains only one DNA molecule.

4. **Examining the G2 Phase**: In the G2 phase (Gap 2), the cell continues to grow and prepares for mitosis. By this phase, DNA replication has already occurred during the S phase, so each chromosome now consists of two DNA molecules (sister chromatids).

5. **Considering the M Phase**: During the M phase (Mitosis), the sister chromatids are separated into two daughter cells. However, the question asks about the presence of two DNA molecules before this separation occurs.

6. **Conclusion**: The only time during the cell cycle when every chromosome contains two DNA molecules is during the G2 phase, after DNA replication has occurred in the S phase and before the chromatids are separated in the M phase.

### Final Answer:
During the cell cycle, every chromosome contains two DNA molecules from the **G2 subphase to anaphase**.

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