Diffusion, Osmosis & Active Transport Crossword Puzzle

QUESTIONS LIST:

• cell membrane : thin outer layer of a cell that controls what goes in and out
• partially permeable : lets some substances pass through but not others
• concentration gradient : difference in concentration between two areas
• high concentration : area with lots of particles of a substance
• low concentration : area with fewer particles of a substance
• equilibrium : when particles are evenly spread and there is no net movement
• phospholipid bilayer : double layer of phospholipids that forms the basic cell membrane
• diffusion : movement of particles from high concentration to low concentration
• passive transport : movement across a membrane without using energy
• facilitated diffusion : passive movement through membrane proteins from high to low concentration
• channel protein : protein tunnel that lets specific molecules or ions pass through
• osmosis : movement of water through a partially permeable membrane from dilute to concentrated solution
• dilute solution : solution with lots of water and few solute particles
• concentrated solution : solution with less water and many solute particles
• hypertonic : solution more concentrated than the cell so water leaves (cell shrinks)
• hypotonic : solution more dilute than the cell so water enters (cell swells, may burst)
• isotonic : same concentration as the cell so no net water movement
• active transport : movement from low to high concentration using energy and carrier proteins
• atp : the cell’s energy molecule used for active transport (energy supply)