Question

Which of the following steps in a signaling pathway typically occurs first once a chemical messenger reaches a target cell?

Answer 1

Question:

Solution:

The cells recognize the stimuli (chemical messengers) through receptors. When the receptors bind to the signaling molecules, physiological responses are initiated, and depending on the nature of those physiological responses, the receptor will be a membrane receptor or an intracellular receptor. So, we can conclude that the correct answer is

A LIGAND BINDS TO A RECEPTOR.