Question

glycoproteins and glycoplipids both have a? attached to them. cholesterol protein carbohydrate phospholipid

Explanation:

Glycoproteins are proteins with carbohydrate chains attached, and glycolipids are lipids with carbohydrate chains attached. The prefix "glyco -" indicates the presence of a carbohydrate. Cholesterol is a lipid, protein is the main component of glycoproteins (but not glycolipids), and phospholipid is a type of lipid (but not the attached group in the name). So, the common attached group is carbohydrate.

Answer:

carbohydrate