Active Transport Cells may need to move molecules

Active Transport § Cells may need to move molecules _____concentration gradient u u u shape change transports solute from one side of membrane to other protein “pump” “costs” energy = ATP _____ conformational change ATP _____ AP Biology “The Doorman”

Active transport § Many models & mechanisms ATP AP Biology ATP ______

Getting through cell membrane § Passive Transport u __________ § diffusion of nonpolar, hydrophobic molecules w lipids w high low concentration gradient u Facilitated transport § diffusion of polar, hydrophilic molecules § through a protein channel w high low concentration gradient § Active transport u diffusion against concentration gradient § ________ u u AP Biology uses a protein pump requires ______ ATP

Transport summary simple diffusion facilitated diffusion active transport AP Biology ATP

How about large molecules? § Moving large molecules into & out of cell through vesicles & vacuoles u endocytosis u § ________ = “cellular eating” § ________= “cellular drinking” u AP Biology exocytosis

Endocytosis ________ fuse with lysosome for digestion _________ non-specific process receptor-mediated endocytosis AP Biology triggered by molecular signal