Differentiated cells are

Options

A. Premitotic specialised
B. Post-mitotic specialised
C. Premeiotic -specialised
D. Post-meiotic specialised

Answer

### Step-by-Step Solution:

1. **Understanding Differentiated Cells**: Differentiated cells are specialized cells that have developed specific functions and characteristics. They arise from stem cells and undergo a process of differentiation.

2. **Cell Cycle Overview**: The cell cycle consists of two main phases: interphase and the mitotic phase (M phase). Interphase includes G1, S, and G2 phases.

3. **Phases of Interphase**:
- **G1 Phase**: This is the first gap phase where the cell grows and prepares for DNA replication. It is known as the post-mitotic phase because it occurs after the cell has divided.
- **S Phase**: This is the synthesis phase where DNA replication occurs.
- **G2 Phase**: This is the second gap phase where the cell continues to grow and prepares for mitosis.

4. **Role of G1 Phase**: During the G1 phase, the cell synthesizes various proteins, RNA, and enzymes necessary for DNA replication. This phase is crucial for cells to prepare for the next steps in the cell cycle.

5. **Conclusion on Differentiated Cells**: Since differentiated cells have already completed the mitotic phase and are specialized for specific functions, they are classified as post-mitotic specialized cells.

6. **Final Answer**: Based on the explanation, the correct answer to the question "Differentiated cells are" is **B) post mitotic specialized**.