What is the role of van der Waals interactions in biological molecules?
Fill in the blank(s) with the appropriate word(s).
Answer: Although they are weak bonds, van der Waals interactions help to reinforce the 3D shapes of large molecules
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The primary function served by erythrocytes is
A. transport of oxygen. B. defense against pathogens. C. buffering against changes in blood pH. D. sealing breaks in the walls of blood vessels. E. transport of water-soluble vitamins.
Jean Baptiste Lamarck developed a hypothesis that has been referred to as "inheritance of acquired characteristics." In it he proposed that
a. giraffes were created with long necks. b. giraffes with slightly longer necks would be better able to reproduce. c. changes in structure size in an individual can be inherited. d. all members of a species must change identically. e. giraffes developed longer necks to compensate for shorter legs.
During the cephalic and absorptive phases, the pancreas releases a great deal of __________ into the blood stream and very little __________.
Fill in the blank(s) with the appropriate word(s).
Which of these events leads to all of the others in a pyrogenic (fever) response?
A) The hypothalamus releases prostaglandins. B) Endotoxin is released from the cell wall of gram-negative bacteria. C) The body's thermostat is set to a higher level, and fever occurs. D) IL-1 is released by macrophages. E) IL-1 travels via the blood to the hypothalamus.