What is the main tenet of the lock-and-key model for drug activity?
A) There is a connection between drug structure and drug shape.
B) Only certain biological keys can unlock the potential of a drug.
C) The key to a drug's success is to keep it locked away from stomach acid.
D) The biological lock of an enzyme can be activated by using certain chemical keys.
E) all of the above
A
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Several companies manufacture large world globes for display in museums, corporate lobbies, and science exhibit halls. If such a globe featured a diameter of 4 m (13 ft), what is the scale of this globe expressed as a representative fraction? (Show your work.) (Hint: Earth’s equatorial diameter = 12,756 km [7926 miles].)
What will be an ideal response?
A depression much larger than the original crater, formed when the volcano collapses into an empty magma chamber is called:
a) vent b) caldera c) basin d) schism e) rift
Cloud droplets begin forming on ________
Fill in the blank(s) with the appropriate word(s).
The U.S. Army Corps of Engineers has identified a number of unsafe dams in this country. In the overwhelming majority of cases, the problem is that
A. the dam is not high enough for high-rainfall events. B. the dam spillway is inadequate. C. the rocks in which the dam is built are weak. D. the dam itself isn't strong enough to contain the water.