Question: What is the function of phosphatases in cell signaling?

Options:

1. To add phosphate groups to proteins
2. To remove phosphate groups from proteins
3. To transport signals across membranes
4. To amplify the signal

Correct Answer: To remove phosphate groups from proteins

Solution:

Phosphatases are enzymes that remove phosphate groups from proteins, thus playing a critical role in deactivating signaling pathways.