AP Bio test chapter 5

Question	Answer
Simple diffusion	Small uncharged nonpolar molecules (h2o, co2, 02, small lipids)
Facilitated diffusion	Ions and polar molecules pass through semipermeable membrane with help of specific proteins
Osmosis	Diffusion of water -aquaporins
Active transport	-requires energy -endocytosis and exocytosis change shape of membrane
Cholesterol on membrane	Prevents membrane from becoming too fluid
Carbohydrate chain on membrane	Acts as cell identification tags
Functions of Membrane proteins (6)	•transport (passive/active) •enzymatic activity •attachment to cytoskeleton and extra cellular membrane •cell to cell recognition •intercellular joining •signal transduction

Resource summary

	Created by Kimberlee Hernandez almost 8 years ago