Exam 8: Cell Membranes

The solutions in the two arms of a U-tube 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 on both sides are equal. Which of the following is the most likely result when the system has reached equilibrium?

Based on the below figure, which of these experimental treatments would increase the rate of sucrose transport into a plant cell?

Which component in the figure above represents a microfilament of the cytoskeleton?

Which component in the figure above represents cholesterol?

Which of the following processes includes all the others?

Which of the following statements best describes a characteristic feature of a carrier protein in a plasma membrane?

Which of the following organelles plays a primary role in the digestion of bacteria engulfed by white blood cells?

Which of the following statements best describes how unsaturated fatty acids increase membrane fluidity at lower temperatures?

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were weighed, and the percent change in mass of each bag was graphed. Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?

Which of the following statements best describes characteristic activities of a sodium-potassium pump?

In what way do the membranes of a eukaryotic cell vary?

Which of the following statements best explains the observation that proton pumps are used by organisms in every domain of life?

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were weighed, and the percent change in mass of each bag was graphed. Which line or lines in the graph represent(s) bags that contain a solution that is hypertonic to the solution in the beaker at 50 minutes?

Which of the following factors is a primary contributor underlying cause of familial hypercholesterolemia?

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were weighed, and the percent change in mass of each bag was graphed. Which line in the graph represents the bag with the highest initial concentration of sucrose?

When the interior of a cell is in equilibrium with its environment, which of the following statements best describes the relative movement of molecules that can diffuse through the plasma membrane?

A defect in which of the following molecules would dramatically reduce the rate of diffusion of water across cell membranes?

An animal cell that lacks carbohydrates on the external surface of its plasma membrane would likely be impaired in which of the following functions?

Which of the following types of molecules are most likely to lack hydrophilic domains?

An organism with a cell wall would most likely be unable to take in materials through which of the following processes?