Consider a substance which carries a message from a receptor to the inside of a cell. To which of the following classifications does this substance most likely belong?
A) secondary messenger
B) ligand
C) chemical messenger
D) Any of the above.
A
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Water covers about ____% of the Earth's surface
a. 51 b. 61 c. 71 d. 81 e. 91
Which of the following terms refers to the leading edge of a thunderstorm's cold downdraft?
A. downburst B. gust front C. squall line D. dryline
How long did the process of density stratification of Earth last?
A) 100 million years B) 100 thousand years C) 10 billion years D) 1 billion years
What best describes why irregular shorelines evolve and become straighter over time?
A. waves erode headlands and deposit sediment in coves and bays B. plate tectonics causes uplift of the land, producing a more uniform coastline C. waves smooth out differences in the width of the beach D. forces that result from Earth spinning on its axis E. continuous sea level rise