Biology Chapter 8 vocabulary

Question Answer
Selective permeability Property of the plasma membrane that allows it to control movement of substance into or out of the cell.
Phospholipid bilayer Plasma membrane layer composed of phospholipids molecules arrange with polar heads facing the outside and nonpolar tails facing the inside.
Transport protein Protein that moves substance or wastes through the plasma membrane.
Fluid mosaic model A plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer.
Diffusion Net movement of particles from an area of higher concentration to an area of lower concentration.
Dynamic equilibrium Condition of continuous, random movement of particles but no overall change in concentration of materials.
Facilitate diffusion Passive transport of ions and small molecules across the plasma membrane by transport protein.
Osmosis Diffusion of water across a selectively permeable membrane.
Isotonic solution A solution with the same concentration of water and solute as inside a cell, resulting in the cell retaining its normal shape because there in no net movement of water.
Hyportonic solution A solution that has a lower concentration of solute outside than inside the cell, causing water to flow into the cell by osmosis.
Hypertonic solution A solution that has a higher concentration of solute outside than inside a cell, causing water to leave the cell by osmosis.
Active transport Energy requiring process by which substance move across the plasma membrane against a concentration gradient.
Endocytosis Energy requiring process by which large substance from the outside environment can enter a cell.
Exocytosis Energy requiring process by which a cell expel waste and secretes substance at the plasma membrane.

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