State whether the following statement is true or false. Receptors are involved in the movement of some materials across the plasma membrane.
A. True
B. False

Answer

To determine whether the statement "Receptors are involved in the movement of some materials across the plasma membrane" is true or false, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Receptors**: Receptors are specialized proteins or glycoproteins located in the plasma membrane of cells. They play a crucial role in cellular communication and signaling.

**Hint**: Remember that receptors can be proteins or glycoproteins and are essential for signaling.

2. **Function of Receptors**: The primary function of receptors is to bind to specific molecules (ligands), such as hormones. This binding triggers a response within the cell, which can include changes in the cell's activities or the opening of channels in the membrane.

**Hint**: Think about how receptors interact with ligands and the resulting cellular responses.

3. **Movement of Materials**: When receptors bind to their ligands, they can facilitate the movement of materials across the plasma membrane. This can occur through various mechanisms, including the opening of ion channels or activation of transport proteins.

**Hint**: Consider how the binding of a ligand to a receptor can lead to changes in the cell membrane that allow materials to move in or out.

4. **Conclusion**: Since receptors are indeed involved in the movement of some materials across the plasma membrane, the statement is true.

**Hint**: Reflect on the role of receptors in facilitating the exchange of materials, confirming their involvement.

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