Question

decide whether each function is carried out by lipids, proteins, or carbohydrates in the cell membrane.
allow the cell to be recognized by other cells
give the membrane its flexibility
pump large molecules across the membrane

Explanation:

• Allow the cell to be recognized by other cells: Carbohydrates on the cell membrane (often in the form of glycoproteins or glycolipids) act as recognition markers.
• Give the membrane its flexibility: Lipids (such as phospholipids and cholesterol) contribute to the membrane's fluidity and flexibility. Cholesterol helps regulate membrane fluidity.
• Pump large molecules across the membrane: Proteins (specifically transport proteins like pumps) are responsible for moving large molecules across the membrane, often against their concentration gradient.

Answer:

• Allow the cell to be recognized by other cells: Carbohydrates
• Give the membrane its flexibility: Lipids
• Pump large molecules across the membrane: Proteins