What is necessary for a target cell to respond to a cell signaling molecule?
A)being close together
B)a second messenger
C)specific receptor proteins
D)All of these choices are necessary.

Question

Quizplus · Accepted Answer

For a target cell to respond to a cell signaling molecule, it must have specific receptor proteins that can recognize and bind to the signaling molecule. Receptor proteins are often found on the target cell's plasma membrane and can trigger intracellular signaling pathways that lead to a cellular response. While being close together and having second messengers may be important for some cell signaling pathways, they are not necessary for all types of signaling and thus are not universal requirements for target cell response.

What Is Necessary for a Target Cell to Respond to a Cell