Cells in continuous culture system are maintained in

Options

A. Stationary phase
B. Lag phase
C. Log phase
D. Either (1) or (3)

Answer

To answer the question "Cells in continuous culture system are maintained in," we need to understand the different phases of cell growth in a continuous culture system.

### Step-by-Step Solution:

1. **Understanding Continuous Culture System**:
- A continuous culture system is a bioreactor setup where old media is continuously removed and fresh media is added. This allows for the maintenance of cells and the production of their products.

2. **Phases of Cell Growth**:
- Cells go through several phases when cultured:
- **Lag Phase**: This is the initial phase where cells adapt to the new environment. There is little to no cell division during this time.
- **Log Phase**: After adaptation, cells enter the log phase, where they grow exponentially. This phase requires a continuous supply of fresh media to sustain growth.
- **Stationary Phase**: In this phase, the growth rate equals the death rate, meaning the number of new cells formed is equal to the number of cells dying. This is a stable phase where cell numbers remain constant.
- **Decline Phase**: Eventually, cells enter a decline phase where the number of dying cells exceeds the number of new cells formed, leading to a decrease in overall cell numbers.

3. **Identifying the Correct Phase**:
- The question asks specifically about the phase in which cells are maintained in a continuous culture system. The key point is that during the log phase, cells are actively growing and require continuous media supply, which is characteristic of a continuous culture system.

4. **Conclusion**:
- Therefore, the correct answer to the question is that cells in a continuous culture system are maintained in the **Log Phase**.

### Final Answer:
Cells in continuous culture system are maintained in **Log Phase**.

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