The ________ are drugs that deposit in developing teeth and cause a permanent brown discoloration.
A. tetracyclines
B. penicillins
C. streptomycins
D. cephalosporins
E. macrolides
Answer: A
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Evolution does not violate the second law of thermodynamics because
A. evolution is a random process; it does not require an input of energy. B. Earth is not a closed system; it constantly receives an input of energy from the sun. C. living organisms are not subject to the second law. D. the disorder generated by extinction balances the order created by evolution.
In lakes and ponds of temperate latitudes, the upper and bottom layers of water usually turn over as water warms up during spring
Indicate whether the statement is true or false
How would an animal compensate for a nonfunctional lateral line?
A. Gas exchange through the gill slits would have to be increased. B. Propulsion and directional control would have to be facilitated by other fins. C. Pressure waves in the water would have to be detected by other sensory structures. D. Skeletal support would need to be reinforced internally. E. Sex recognition by male fish would have to be accomplished by the olfactory structures.
If proteins A and B have complementary surfaces, they may interact to form the dimeric complex AB. Which of the following is the correct way to calculate the equilibrium constant for the association between A and B?
(a) kon/koff = K (b) K = [A][B]/[AB] (c) K = [AB]/[A][B] (d) (a) and (c)