Diffusion of a molecule from low concentration to the high concentration

Options

A. can take place
B. can't take place
C. take place in presence of proteins
D. It is irrelevant

Answer

### Step-by-Step Solution:

1. **Understanding Diffusion**:
- Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. This process occurs spontaneously and does not require energy (ATP).

2. **Direction of Movement**:
- The question states "from low concentration to high concentration." However, diffusion inherently moves substances along the concentration gradient, which means it goes from high concentration to low concentration.

3. **Passive Process**:
- Since diffusion is a passive process, it does not require any energy input. This distinguishes it from active transport, which does require energy to move substances against their concentration gradient.

4. **Role of Proteins**:
- While proteins can facilitate the movement of certain molecules (as seen in facilitated diffusion), they are not involved in simple diffusion. Therefore, the presence of proteins is irrelevant to the basic concept of diffusion.

5. **Conclusion**:
- Given that diffusion cannot occur from low concentration to high concentration, the correct answer to the question is that this process "can't take place."

### Final Answer:
The diffusion of a molecule from low concentration to high concentration **can't take place**.

---