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Ch.5 Plasma Membrane

QuestionAnswer
What are the 4 components of the plasma membrane? The phospholipid bilayer, cholesterol, protein and glycocalyx
Explain one function of the plasma membrane: Keeping the goods concentrated, while keeping harmful material out.
Explain the second function of a plasma membrane: communicating with other cells
What is osmosis? The net movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
What is diffusion? The movement of molecules from a region of high concentration to low concentration.
What are the four functions of a protein? Structural support (attach to cytoskeleton), recognition (helps immune system determine itself from foreign objects), communication (receptors and binding sites), and transport (allow molecules to pass)
Describe coupled reaction: Where one reaction requires energy, and the other produces energy.
Explain exocytosis: Movement of materials out of the cell by fusion of vesicles with the plasma membrane.
Explain endocytosis: Infolding of the plasma membrane to bring large materials into the cell.
List the 3 forms of endocytosis: Pinocytosis, receptor- mediated endocytosis, and phagocytosis.
What is pinocytosis? Cell drinking
What is receptor- mediated endocytosis (RME)? Receptor capturing ligand and concentrating into an invaginating pit.
What is phagocytosis? Cell eating
Explain phagocytosis: How the human immune system ingests whole bacteria.
Explain pinocytosis: Water and solvents are enclosed in an invaginating vesicle, used in digestive tract.
What is a phospholipid? 2 fatty acid chains and a polar phosphate group attached to the glycerol.
What's the arrangement of phospholipids in water? 2 layers: heads pointing out & the tails pointing in.
What is cholesterol? Prevents passage of some small molecules and adds fluidity.
What are the 2 main types of transport? Passive transport the membranes travel down the concentration gradient and enter w/out energy output by cell. And active transport the membrane travels up the concentration gradient w/ energy from ATP.
Created by: Jalisha_02