Which statement about signaling receptors is true?

Suppose you have an antibody that binds to the receptor tyrosine kinase illustrated in Figure 11.16. When you add this antibody to the cell, you find that it activates the cell response, even when no signaling molecule is present. Explain this result.

The molecules that convert extracellular signals into intracellular signals are:

Which type of receptor leads directly to a change in the distribution of ions on opposite sides of the membrane?