In mammalian kidneys, blood in the vasa recta and fluid in the loop of Henle flow in opposite directions to create a ____________ multiplier system.
A. reversible
B. homeostatic
C. countercurrent
D. exponential
E. stepped
C. countercurrent
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The average pregnancy (measured from the last menstrual period) lasts for how many weeks?
A. 40 B. 36 C. 38 D. 32 E. 42
Relaying a message from a receptor protein to a molecule that performs a specific function within a cell is called?
A) signal transduction B) inhibition C) self-recognition D) selective permeability
Antigen binding sites on one antibody:
a. are the same as on all other antibodies b. will bind to several different antigens c. are unique and specific to one antigen d. consist of light chain variable regions only e. are the same as all membrane bound receptors
Which of the following is characteristic of animals?
a. heterotrophy. b. autotrophy. c. photosynthesis. d. both b and c.