If all protein transporters of membrane are saturated then rate of diffusion:

Options

A. Is maximum
B. Remains same
C. Is minimum
D. Is optimum

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of Protein Transporters**:
- Protein transporters, also known as carrier proteins, are integral membrane proteins that facilitate the transport of substances across a cell membrane. They have specific binding sites for the solute they transport.

2. **Defining Saturation of Transporters**:
- Saturation occurs when all the binding sites on the protein transporters are occupied by solute molecules. At this point, no additional solute can bind to the transporters.

3. **Analyzing the Effect of Saturation on Diffusion**:
- When all binding sites are occupied, the transporters can no longer facilitate the movement of additional solute molecules. However, the rate of diffusion of the solute across the membrane reaches its maximum capacity at this saturation point.

4. **Conclusion**:
- Therefore, if all protein transporters of the membrane are saturated, the rate of diffusion is at its maximum. This means that the transport of solute molecules is occurring at the highest possible rate given the number of available transporters.

5. **Selecting the Correct Answer**:
- Based on the understanding that saturation leads to maximum transport capacity, the correct answer to the question is that the rate of diffusion is maximum when all protein transporters are saturated.