A receptor protein in the plasma membrane will not bind to just any chemical in the extracellular fluid, but only to certain ones. This property is called ________.
A. saturation
B. specificity
C. fidelity
D. efficacy
E. selectivity
Answer: B
You might also like to view...
The sodium-potassium exchange pump transports __________ Na+ ions and __________ K+ ions for every ATP molecule used.
A) 1;2 B) 2;2 C) 2;3 D) 3;2 E) 3;3
Which of the following statements regarding the structure and function of cell membranes is correct?
A. The phospholipid bilayer is arranged so that the hydrophilic heads of the phospholipid molecule face the extra- and intracellular fluids. B. Some proteins integrated into the membrane serve as channels for the passage of nonpolar molecules through the membrane. C. Peripheral membrane proteins function as channels associated with transport of ions through the membrane. D. Cholesterol molecules function to transport ions from one side of the plasma membrane to the other. E. The plasma membrane is a layer of phospholipid molecules with their hyrophilic head groups in contact with the extracellular solution and the hydrophobic tail groups in contact with the intracellular solution.
Positive selection of lymphocytes refers to the
A. proliferation of natural killer cells. B. replication of memory cells. C. production of antigen-specific antibodies. D. processing of an antigen by a macrophage. E. survival of pre-B and pre-T cells that are capable of an immune response.
The muscle contracts but does not shorten, even though an increase in muscle tension does occur. This sentence describes:
a. twitch contractions b. tetanic contractions c. isotonic contractions d. isometric contractions