_____ curve is obtained for cells in culture.

Options

A. J-shaped
B. Linear
C. V-shaped
D. S-shaped

Answer

To answer the question, "_____ curve is obtained for cells in culture," we need to identify the type of growth curve that is typically observed in cell cultures.

### Step-by-Step Solution:

1. **Understanding Growth Rate**:
- The growth rate refers to the increase in growth per unit time. In the context of cells, this means how quickly the cells are dividing and increasing in number.

2. **Identifying Phases of Growth**:
- When cells are cultured, their growth can be divided into distinct phases:
- **Lag Phase**: This is the initial phase where cells are adapting to their environment. There is little to no increase in cell number during this phase.
- **Exponential Phase**: Following the lag phase, cells begin to divide rapidly, leading to a significant increase in cell number. This phase is characterized by a maximum growth rate.
- **Stationary Phase**: Eventually, the growth rate slows down as resources become limited, and the number of new cells being produced equals the number of cells dying. This results in a plateau in the growth curve.

3. **Shape of the Growth Curve**:
- The overall shape of the growth curve for cells in culture is typically sigmoidal (S-shaped). This shape reflects the slow initial growth (lag phase), rapid growth (exponential phase), and eventual leveling off (stationary phase).

4. **Conclusion**:
- Based on the analysis, the correct answer to the question is that the growth curve obtained for cells in culture is an **S-shaped curve**.

### Final Answer:
The correct answer is **S-shaped curve**.