Protiens in the membrane are responsible for which type of diffusion ?

Options

A. Facilitated diffusion
B. Active transport
C. Simple diffusion
D. Both (1) and (2)

Answer

### Step-by-Step Solution:

1. **Understanding the Types of Transport:**
- There are different types of transport mechanisms in biological membranes, including facilitated diffusion, active transport, and simple diffusion.

2. **Facilitated Diffusion:**
- This is a type of passive transport where molecules move across the membrane along their concentration gradient (from high to low concentration) with the help of specific proteins.
- No energy (ATP) is required for this process.

3. **Active Transport:**
- In contrast, active transport requires energy (ATP) because it moves substances against their concentration gradient (from low to high concentration).
- This process also involves specific membrane proteins that act as pumps.

4. **Simple Diffusion:**
- Simple diffusion is another form of passive transport where molecules move directly through the membrane without the need for proteins or energy.
- Molecules move from an area of higher concentration to an area of lower concentration in a random manner.

5. **Identifying the Role of Proteins:**
- From the above explanations, it is clear that proteins are necessary for both facilitated diffusion and active transport.
- Simple diffusion does not require proteins.

6. **Conclusion:**
- Therefore, the proteins in the membrane are responsible for both facilitated diffusion and active transport.

### Final Answer:
The proteins in the membrane are responsible for **facilitated diffusion** and **active transport**.