AP BIOLOGY

Detailed explanation-1: -Which of the following steps in a signaling pathway typically occurs first once a chemical messenger reaches a target cell? A ligand binds to a receptor.

Detailed explanation-2: -Reception – This is the first stage of the cell signaling pathway. During this stage, a signaling molecule binds to a receptor protein located on the surface of the cell or inside the cell.

Detailed explanation-3: -Many pathways involve second messengers, small, non-protein molecules that pass along a signal initiated by the binding of a ligand (the “first messenger”) to its receptor.

Detailed explanation-4: -Three Stages of Cell Signaling First, reception, whereby the signal molecule binds the receptor. Then, signal transduction, which is where the chemical signal results in a series of enzyme activations. Finally, the response, which is the resulting cellular responses.

Detailed explanation-5: -Reception: Reception is when the cell detects a signaling molecule from the cell’s extracellular matrix. This signal then binds to its specific receptor and causes a change in the protein receptor shape.