Interphase of cell cycle involves:

Options

A. Duplication of centrioles and mitochondria
B. DNA replication
C. Synthesis of RNAs, proteins and ATP
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Interphase**: Interphase is the longest phase of the cell cycle, where the cell prepares for division. It consists of three sub-phases: G1 (Gap 1), S (Synthesis), and G2 (Gap 2).

2. **Identifying Events in Interphase**:
- **G1 Phase**: This is the first sub-phase where the cell grows and synthesizes proteins, RNAs, and ATP. It is crucial for preparing the cell for DNA replication.
- **S Phase**: During this phase, DNA replication occurs. The cell duplicates its genetic material, ensuring that each daughter cell will receive an identical set of chromosomes. Additionally, centrioles (which are important for cell division) and mitochondria also duplicate during this phase.
- **G2 Phase**: This is the final sub-phase where the cell continues to grow and prepares for mitosis. It involves further synthesis of proteins and organelles.

3. **Evaluating the Options**:
- **Option 1**: Duplication of centrioles and mitochondria - This is correct as it occurs in the S phase and G1 phase.
- **Option 2**: DNA Replication - This is correct as it specifically occurs in the S phase.
- **Option 3**: Synthesis of RNAs, Proteins, and ATP - This is correct as it occurs in the G1 phase.
- **Option 4**: All of these - Since all the previous options are correct, this option is also correct.

4. **Conclusion**: The correct answer to the question is option 4, which states that all of the mentioned processes are involved in the interphase of the cell cycle.