Question

carbohydrate chains attached to proteins; glycoproteins; protein pumps; glycolipids; cholesterol

Explanation:

Glycoproteins are defined as proteins with carbohydrate chains (glycans) attached to them. The diagram describes "carbohydrate chains attached to proteins", which matches the definition of glycoproteins. Protein pumps are involved in transport, glycolipids have carbohydrate chains attached to lipids (not proteins), and cholesterol is a lipid. So the correct match is glycoproteins.

Answer:

A. glycoproteins (assuming the options are labeled with the colored boxes, and the orange box with "glycoproteins" is the correct one)