Question

most receptor proteins are embedded in the ______ of the cell membrane.
a lipid bilayer
b protein matrix
c sodium channels
d cholesterol sites

Explanation:

The cell - membrane structure is a lipid bilayer, and most receptor proteins are embedded in this lipid bilayer. The lipid bilayer provides a suitable environment for the function of receptor proteins. Protein matrix is not the main structure where receptor proteins are embedded. Sodium channels are for ion - transport and not the location for most receptor proteins. Cholesterol sites are not the primary location for receptor protein embedding.

Answer:

A. lipid bilayer