How many different types of molecules are shown in Model 1?

How many triangles are on the lefts side?

How many triangles are on the right side?

Is there evidence to show the triangle can cross the semi-permeable membrane?

How many circles are on the left side?

How many circles are on the right side?

Is there evidence to show the circle can cross the semi-permeable membrane?

If you left this "system" for an extended period of time and then viewed it again, would you expect to find any changes in the concentrations of the molecules on either side of the membrane?

What two major types of biological molecules compose the majority of the cell membrane in this model? (pick 2)

How many different protein molecules are in the picture?

When a carbohydrate chain is attached to a protein, what is the structure called?

When a carbohydrate chain is attached to a lipid, what is the structure called?

What types of molecules are shown moving across the membrane?

How does the concentration of the small molecules inside the cell compare to that outside the cell?

Because particles move randomly, molecules tend to move across the membrane in both directions. Does the picture indicate that the molecules are moving in equal amounts in both direction?

Looking back at this image, which particles are moving by diffusion across the membrane?

Diffusion is the net movement of molecules from an area of ___________ concentration to an area of ____________ concentration.

Molecules will continue to move along a concentration gradient until they reach ______.

Once equilibrium is reached, how will molecules move across a membrane?