Exam 5: Membrane Transport and Cell Signaling

A patient has had a serious accident and lost a lot of blood. In an attempt to replenish body fluids, distilled water - equal to the volume of blood lost - is transferred directly into one of his veins. What will be the most probable result of this transfusion?

Which of the following correctly describes the relationship between an enzyme and its function?

Figure 5.3 The solutions in the arms of a U-tube (Figure 5.3) are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same. Refer to the figure to answer the following questions. -If you examine side A in the figure after three days, you should find

Which of the following tend to lack hydrophobic regions on their surface?

A primary function of polysaccharides attached to glycoproteins and glycolipids of animal cell membranes is to

Submerging a red blood cell in a hypertonic solution will result in

Which of the following are localized on the exterior of a phospholipid bilayer?

Figure 5.2 The solutions in the two arms of this U-tube (Figure 5.2) are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels are equal. Refer to the figure to answer the following question(s). -Initially, in terms of tonicity in the figure, the solution in side A with respect to that in side B is

Which of the following factors would tend to increase membrane fluidity?

Following activation of a receptor, which sequence below represents the correct order in which components will be involved in a signaling pathway that utilizes the second messenger cAMP?

Which of the following characteristics is unique to plant hormones?

Which of the following would diffuse through the lipid bilayer of a plasma membrane most rapidly?

Which of the following is the greatest advantage of having multiple steps in a transduction pathway?

Which of the following processes includes all the others?

The primary function of phosphatases in signal transduction is to

Submerging a plant cell in distilled water will result in

A primary function of cholesterol in the plasma membranes of some animals is to

Which of the following is the most likely fate of animal cells that lack receptors for local paracrine signal molecules?

Approximately what proportion of human genes are thought to encode protein kinases?

Which of the following provides the most likely explanation for why cell membranes are asymmetrical?