`G_(1)` stage of interphase of cell cycle shows

Options

A. Active synthesis of DNA
B. Active synthesis of RNA
C. Active synthesis of protein
D. Both B and C.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases, including interphase and mitotic phase. Interphase is further divided into three main stages: G1 (Gap 1), S (Synthesis), and G2 (Gap 2).

2. **Identifying the G1 Phase**: The G1 phase is the first stage of interphase, occurring before the S phase. It is primarily a growth phase where the cell prepares for DNA replication and cell division.

3. **Activities during G1 Phase**:
- **Cell Growth**: During the G1 phase, the cell increases in size and synthesizes various components necessary for DNA replication.
- **Synthesis of RNA**: There is active synthesis of mRNA during the G1 phase. This mRNA is crucial for the production of proteins.
- **Synthesis of Proteins**: As mRNA is synthesized, proteins are also synthesized from this mRNA, which are essential for the cell's functions and preparation for division.

4. **Clarifying the Role of the S Phase**: It is important to note that the actual synthesis of DNA occurs during the S phase, not the G1 phase. Therefore, any option suggesting active DNA synthesis in G1 is incorrect.

5. **Conclusion**: The correct answer to the question about what the G1 stage of interphase shows is that it involves the active synthesis of RNA and proteins. Thus, the correct option is "both B and C".

**Final Answer**: The G1 stage of interphase shows active synthesis of RNA and proteins (both B and C).

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