The classical pathway for complement activation is initiated by
A) lipid-carbohydrate complexes and C3.
B) C5-C9.
C) antigen-antibody reactions.
D) factors released from phagocytes.
E) factors released from damaged tissues.
C
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The adrenal hormone, aldosterone, regulates kidney function by
A. stimulating active reabsorption of sodium, decreasing its excretion. B. increasing the permeability of the collecting duct to salt. C. increasing the permeability of the collecting duct to urea. D. triggering a sensation of thirst. E. reducing the blood flow to the kidney.
How is global climate change associated with deforestation?
What will be an ideal response?
Which of the following phyla is the most diverse and numerous?
A) The chordates B) The cnidarians C) The echinoderms D) The arthropods
Eukaryotic chromosomes differ from prokaryotic chromosomes in that they
A) are simpler. B) are circular in structure. C) include fewer proteins. D) are housed in a membrane-enclosed nucleus.