Biology

The correct answer is: A.Confirmation change in shape of receptor

Explanation:

When a ligand (a signaling molecule) binds to its receptor, it typically causes a conformational change in the receptor's structure. This change in shape is critical because it activates the receptor and initiates a signaling cascade within the cell. The conformational change allows the receptor to interact with other molecules, such as G proteins or enzymes, that help propagate the signal inside the cell.

Here’s why the other options are not correct:

B.Phosphorylation of ligand: The ligand itself is not phosphorylated. Phosphorylation typically occurs on the...