Exam 5: Cell Membranes and Signalling

Physiological saline is 0.9% NaCl. Red blood cells placed in such a solution will NOT gain or lose water; therefore, one could state that the fluid in red blood cells is hypertonic.

What should the tonicity of the distilled water be compared to body cells?

Identify the structures indicated in this drawing of a typical plasma membrane. -peripheral proteins

When do cells undergo exocytosis?

Of the molecules found in membranes, which demonstrate dual solubility characteristics?

What are the major structural components of a cell membrane?

What is responsible for the selective permeability of a cell membrane?

Which of the following will diffuse most rapidly across membranes?

What type of channel opens in response to changes in ionic charge across a membrane?

Which pair of activities are carrier molecules involved in?

How are integral and peripheral proteins similar to each other?

What is the primary function of a cellular membrane?

Why do the cells die when the ambient temperature drops to freezing?

Suppose an animal cell was placed in a beaker of solution. The cell immediately began to swell and ultimately burst. Why did this happen?

How do the various membranes of a cell differ?

Match each mechanism of cellular transport with its correct definition. -osmosis

In an aqueous environment, how are the phospholipids of a membrane arranged?

How are exocytosis and endocytosis different?

Match each mechanism of cellular transport with its correct definition. -receptor-mediated endocytosis

Which of the following is created as ions diffuse across membranes?