Question

a receptor protein that binds with a signaling molecule and relays the message into the cell by activating other molecules inside the cell an active transport protein that moves molecules across a membrane against their concentration gradient a protein involved in enzymatic activity a glycoprotein that is involved in cell - cell recognition an attachment protein that provides structural support

Explanation:

The image depicts a protein in a cell - membrane context. The description of moving molecules against their concentration gradient is characteristic of active - transport proteins. Receptor proteins bind signaling molecules for message - relay, proteins in enzymatic activity catalyze reactions, glycoproteins are for cell - cell recognition, and attachment proteins provide structural support.

Answer:

an active transport protein that moves molecules across a membrane against their concentration gradient