PLASMA MEMBRANE

• What do anchoring proteins do in the plasma membrane?

  They stabilize the membrane's position
• How are membrane proteins related to the cytoskeleton?

  They are bound to the cytoskeleton inside the cell
• What role do recognition proteins play?

  They are detected by immune system cells
• What types of proteins can enzymes in plasma membranes be?

  They may be integral or peripheral proteins
• What do receptor proteins bind to?

  Specific extracellular molecules called ligands
• What is a ligand?

  A molecule that binds to a receptor protein
• What types of molecules can ligands be?

  They can range from small ions to large hormones
• What do carrier proteins do?

  They bind solutes and transport them across the membrane
• What are channels in the plasma membrane?

  Integral proteins with a central pore
• What do channels permit to pass through the plasma membrane?

  Water and small solutes that cannot cross lipid layers
• How do channels facilitate the movement of substances?

  By forming a passageway across the plasma membrane