biology AS chapter 4

why are phospholipids important in cell surface membranes?

What are the functions of the phospholipids in the cell membrane?

what are the main ways proteins are embedded into the phospholipid bilayer?

what are the basic uses of proteins in the cell membrane?

what are the functions of cholesterol?

what is the functions glycolipids in the cell membrane?

what are the main functions of glycoproteins in a cell membrane?

why don't many substances diffuse across cell membranes?

explain the fluid mosaic model.

define diffusion

why is diffusion described as a passive process?

why is facilitated diffusion necessary?

what is the mechanism of facilitated diffusion?

how do protein channels act in facilitated diffusion?

how do carrier proteins act in facilitated diffusion?

define osmosis

define solution

how is water potential measured

what is the water potential of pure water at standard conditions, and what are standard conditions?

what does the addition of a solute do to water potential?

how do the values of water potential work?

explain what happens to animal cells if the external conditions are:
a) higher in water potential
b) the same water potential
c) lower water potential

define active transport

how do carrier proteins work?

what are the two main differences between active transport and facilitated diffusion?

how do co-transport carrier proteins work?

explain the glucose-sodium co-transport process.