Membrane Proteins Quiz

What is the main function of the phospholipid bilayer in the plasma membrane?

• Providing a barrier to the movement of some substances

• Transporting proteins across the membrane

• Binding peptide hormones

• Acting as cell markers

Which type of membrane protein is partially hydrophobic and embedded in the phospholipid bilayer?

• Integral proteins

• Peripheral proteins

• Glycoproteins

• Channel proteins

What is the function of transport proteins in the membrane?

• Acting as immobilized enzymes

• Binding peptide hormones

• Allowing ions and polar molecules to travel across the membrane

• Facilitating cell adhesion

Which type of transport protein changes shape to transport a substance across the membrane?

• Glycoproteins

• Peripheral proteins

• Channel proteins

• Carrier proteins

What is the role of receptors in the membrane?

• Binding peptide hormones and triggering reactions inside the cell

• Acting as cell markers

• Facilitating cell adhesion

• Allowing ions to travel across the membrane

What is the function of immobilized enzymes in the membrane?

• Facilitating cell adhesion

• Acting as integral proteins with the active site exposed on the surface

• Binding peptide hormones

• Allowing ions to travel across the membrane

What is the role of glycoproteins in the membrane?

• Acting as immobilized enzymes

• Binding peptide hormones

• Allowing ions to travel across the membrane

• Acting as cell markers for cell-to-cell recognition

Which of the following is NOT a function of membrane proteins?

• Transporting ions and molecules

• Facilitating cell adhesion

• Providing a barrier to the movement of substances

• Acting as receptors for hormones

What type of protein is attached to the surface of integral proteins or the plasma membrane via a hydrocarbon chain?

• Channel proteins

• Peripheral proteins

• Integral proteins

• Glycoproteins

Which of the following is true about the protein content of membranes?

• It is the same in all cells

• It is lowest in the mitochondria

• It varies depending on the function of the cell

• It is highest in the plasma membrane