Exam 4: Membrane Structure and Function

Kidney dialysis relies on diffusion of various dissolved waste molecules (solutes)across a non-living semipermeable membrane.If the concentration of solutes in the blood increases over time before dialysis is administered,what will happen to the rate of dialysis when it occurs?

When a substance moves from an area of low concentration to an area of high concentration while using energy,the process is termed

A cell is placed in a solution of large nutrient molecules tagged with a red dye.Soon the cell is dark red,showing a concentration of the nutrient much higher than the external solution.We add a reagent that blocks the use of ATP.What result would you expect from this experiment?

Which is a correct example of tonicity?

Oxygen diffuses into the capillaries of the lungs because there is

When blood supplies oxygen and food to a cell surface and these molecules diffuse across,we might expect some "resting time." However,if we inspected most cell membranes in a living human body,we would find a nearly continuous flow of substances back-and-forth across the plasma membrane.Which of the following is not a reason why?

If a cell lacks ATP,which of the following processes would cease to operate immediately?

Permeability refers to

List the three types of intercelluar junctions found in animal cells and indicate their function.

A student sitting on the back row opened a bottle of foul-smelling perfume and dabbed it on her wrists.One by one (beginning from the back of the room)the students began to cough due to the foul smell.This phenomena was due to

The definition of osmosis is the

Which statement is false concerning movement of molecules across the cell membrane?

When water enters a plant cell

Carrier molecules are required for

Red blood cells come in many blood types including A,B,AB,and type O (lacking proteins A and B),Rh positive,Rh negative (lacking Rh+),and many others.If blood is transfused,the recipient detects any new or foreign proteins.The blood type proteins are

Which of the following molecules add stiffness and strength to the plasma membrane?

A differentially permeable membrane separates a molasses solution from distilled water.Over time,the

Which components of a cell membrane are used for cell-to-cell recognition?

A cell placed in a hypotonic solution will

Of the following conditions,which is absolutely necessary for diffusion to take place?