Exam 5: Biological Membranes

MATCHING a.Transmit information into cell d.Use ATP to transport solutes b.Catalyze reactions which take place within or along membrane surface e.Anchor cell to extracellular matrix c.Allow selective transport of ions or molecules -signal transuction receptors

All of the following are functions of the cell membrane EXCEPT:

A bacterium containing sodium ions at a concentration of 0.1 mM lives in a pond that contains sodium ions at 0.005 mM.Evidently, sodium ions are entering the cell by:

Peripheral proteins are linked to either surface of the plasma membrane by:

Mutations to ABC transporter genes contribute to cystic fibrosis. __________________

Catalysts are reusable.Enzymes are protein catalysts, and are reusable.Select the protein(s) below that is(are) not used up by the process carried out:

Consider a U-tube that initially contains pure water on one side of a selectively permeable membrane and water plus solute on the other side.Which of the following best describes what will happen next?

In the cotransport of glucose and sodium ions:

MATCHING a.Transmit information into cell d.Use ATP to transport solutes b.Catalyze reactions which take place within or along membrane surface e.Anchor cell to extracellular matrix c.Allow selective transport of ions or molecules -integrins

A plant cell placed in a hypertonic solution will:

A bottle of perfume is opened on the opposite side of the room and within minutes you begin to smell the perfume.This phenomenon is a classic example of:

Simple diffusion may involve the movement of __________ through the plasma membrane down a concentration gradient.

In a lipid bilayer, __________ fatty acid tails face each other within the bilayer and form a region that excludes water.

LDL cholesterol is taken into the cell by receptor-mediated endocytosis. __________________

A transmembrane protein differs from other membrane proteins because it:

MATCHING a.Transmit information into cell d.Use ATP to transport solutes b.Catalyze reactions which take place within or along membrane surface e.Anchor cell to extracellular matrix c.Allow selective transport of ions or molecules -protein pumps

Figure 5-1 Use the figure to answer the corresponding question(s). -Refer to Figure 5-1.Which of the following statements about the red blood cells in Figure A is true?

Although glucose molecules constantly diffuse into a cell along their concentration gradient, equilibrium is never reached and glucose continues to enter the cell.This is a direct result of:

Compare and contrast the processes of facilitated diffusion and active transport.

Which of the following membrane activities does NOT require the expenditure of energy by the cell?