Temperature extremes, lack of water, and other environmental stresses trigger an increase in which hormone?
a. gibberellin
b. auxin
c. abscisic acid
d. ethylene
e. cytokinin
c
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Ten individuals of two inbred strains of mice, A and B, are fed identical diets. All have normal blood sugar as adults. The same mice are then fed diets high in sugar. Mice from strain B develop diabetes, but mice from strain A do not
Diabetes in strain B mice results from: A. the interaction of their diet with their genotype. B. their genotypes, which are different from strain A mice. C. their diets, which are different from strain A mice. D. their norm of reaction to sugar in their diets. E. None of these choices is correct.
What was the purpose of repeatedly drying, freezing, and thawing some of the fungi?
A. to kill the fungi B. to make the fungus more susceptible to the virus C. to prepare the fungi to infect the panic grass D. to remove the virus E. to prepare the fungi for growth at 65°C
Why do you NOT need to memorize the type of ion each atom tends to form
a) Because this information is spelled out in the periodic table. b) Because this is more science than the non-science major needs to know. c) Because this information is readily available on the Internet. d) Because the type of ion an atom forms depends on the environmental conditions.
Formation of a lipid bilayer is energetically favorable. How does this arrangement result in higher entropy for the system, and thus make bilayer formation energetically favorable?
(a) Polar head groups form a hydrogen-bonding network at the interface with water. (b) Water molecules form cagelike structures around hydrophobic molecules. (c) Hydrogen bonds form between neighboring polar head groups in the bilayer. (d) Fatty acid tails are highly saturated and flexible.