Both facilitated and active transport

Options

A. Require carrier proteins
B. Occur against concentration gradient
C. Show movement of transport proteins
D. Are insensitive to the inhibitors

Answer

To answer the question regarding facilitated and active transport, we will analyze each option provided in the question:

1. **Option A: Requires carrier proteins**
- **Facilitated Transport**: This type of transport does require carrier proteins to help move substances across the cell membrane.
- **Active Transport**: This also requires carrier proteins (often referred to as pumps) to move substances against their concentration gradient.
- **Conclusion**: This statement is true for both types of transport. Therefore, this option is incorrect.

2. **Option B: Occur against concentration gradient**
- **Facilitated Transport**: This type of transport occurs along the concentration gradient, meaning it moves substances from an area of higher concentration to an area of lower concentration.
- **Active Transport**: This type of transport does occur against the concentration gradient, moving substances from an area of lower concentration to an area of higher concentration.
- **Conclusion**: This statement is true for active transport but false for facilitated transport. Therefore, this option is incorrect.

3. **Option C: Show movement of transport proteins**
- Both facilitated diffusion and active transport involve the movement of molecules across the cell membrane through specific transport proteins.
- **Conclusion**: This statement is true for both types of transport. Therefore, this option is correct.

4. **Option D: Are insensitive to inhibitors**
- Both facilitated diffusion and active transport can be affected by inhibitors. For example, certain drugs can inhibit the function of transport proteins.
- **Conclusion**: This statement is false for both types of transport. Therefore, this option is incorrect.

**Final Answer**: The correct option is **C: Show movement of transport proteins**.

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