Smaller cells have

Options

A. Small surface area per volume ratio
B. Large surface area per volume rartio
C. Slow exchange rate of nutrients
D. None of the above

Answer

To solve the question "Smaller cells have," we will analyze the options provided and understand the concept of surface area to volume ratio in cells.

### Step-by-Step Solution:

1. **Understanding Cell Size and Surface Area to Volume Ratio**:
- The surface area to volume ratio is a critical concept in biology that describes how much surface area a cell has relative to its volume.
- As a cell increases in size, its volume grows faster than its surface area. This means that larger cells have a smaller surface area per unit of volume.

2. **Evaluating the Options**:
- **Option A: Smaller surface area per volume ratio**: This is incorrect because smaller cells actually have a larger surface area relative to their volume.
- **Option B: Large surface area per volume ratio**: This is correct. Smaller cells have a larger surface area relative to their volume, which allows for more efficient transport of materials in and out of the cell.
- **Option C: Slow exchange rate of nutrients**: This is incorrect because smaller cells, with their larger surface area to volume ratio, can exchange nutrients more quickly than larger cells.
- **Option D: None of the above**: This is also incorrect since option B is a valid statement.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option B: large surface area per volume ratio**.

### Final Answer:
**B: large surface area per volume ratio**