Which of the following is true of peptidergic messengers?
A) None act directly, they all require a secondary messenger.
B) They all utilize G-protein-adenylate cyclase in a second messenger system.
C) They all use derivatives of phosphatidylinositol in a second messenger system.
D) None of the above is true.
A
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Which of the following linkages is found in glycerophospholipids?
A) glycerol-fatty acid-phosphate B) glycerol-phosphate-fatty acid C) phosphate-glycerol-alcohol D) none of the above
Which of the following energy sources is thought to drive the lateral motions of Earth's lithospheric plates?
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Of the places listed below, ocean waters generally have the least salinity in ________
A) subtropical zones B) polar regions C) small seas and gulfs D) hot places E) places with lack of rainfall