State whether the following statement is true or false. Carrier proteins are necessary for active transport to occur.
A. True
B. False

Answer

To determine whether the statement "Carrier proteins are necessary for active transport to occur" is true or false, we can analyze the role of carrier proteins in the context of active transport.

### Step-by-Step Solution:

1. **Understanding Active Transport**:
- Active transport is the process by which cells move substances against their concentration gradient, meaning from an area of lower concentration to an area of higher concentration. This process requires energy, typically in the form of ATP.

2. **Role of Carrier Proteins**:
- Carrier proteins are specialized proteins embedded in the cell membrane that facilitate the movement of substances across the membrane. They can change shape to transport molecules from one side of the membrane to the other.

3. **Active Transport and Carrier Proteins**:
- In active transport, carrier proteins are indeed required to transport molecules. These proteins bind to the specific molecules that need to be transported and use energy (from ATP) to move them against their concentration gradient.

4. **Conclusion**:
- Since carrier proteins are essential for the process of active transport to occur, we can conclude that the statement is true.

### Final Answer:
**A. True**

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