BIO 181 Chapter 5 well answered to pass

BIO 181 Chapter 5the fluid mosaic model - correct answer states that the membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids integral proteins - correct answer penetrate the hydrophobic interior of the bilayer peripheral proteins - correct answer are loosely bound to the surface of the membrane carbohydrates on the external side of the plasma membrane - correct answer vary among species, individuals, and even cell types in an individual carbohydrates(on the external plasma membrane) - correct answer allow cells to recognize each other plasma membranes are - correct answer selectively permeable, regularly the cell's molecular traffic passive transport is - correct answer diffusion of a substance across a membrane with no energy investment hydrophobic (nonpolar) molecules, - correct answer such as hydrocarbons, can dissolve in the lipid bilayer of the membrane and cross it easily polar molecules, - correct answer such as sugars, do not cross the membrane easily Diffusion is - correct answer the tendency for molecules to spread out evenly into the available space substances diffuse down - correct answer their concentration gradient, from where it is more concentrated to where it is less concentrated