Detergents are best able to dissolve oil from fabric or dishes during washing because
A) the positively charged end is associated with a sphere of hydration, while the negatively charged end interacts with the oil droplet.
B) the negatively charged end is associated with a sphere of hydration, while the positively charged end interacts with the oil droplet.
C) the nonpolar end is associated with a sphere of hydration, while the charged end interacts with the oil droplet.
D) the charged end is associated with a sphere of hydration, while the nonpolar end interacts with the oil droplet.
E) because detergents are nonpolar, they increase the size of the oil droplet, allowing the water to be more effective at removing the oil.
D) the charged end is associated with a sphere of hydration, while the nonpolar end interacts with the oil droplet.
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Diphtheria is an acute contagious disease caused by an exotoxin that
A. functions by inhibiting protein synthesis. B. can be neutralized as a result of immunity produced by the DTaP vaccine. C. may cause destruction of cardiac, kidney and nerve tissues. D. All of the choices are correct.
A protein kinase activating many other protein kinases is an example of _____.
a. deactivation b. sensitization c. mutualism d. a cellular response e. amplification
An apparent departure from the rule that species diversity increases toward lower latitudes is the decrease in species of mammals as one moves southward on the peninsula of Baja California. What factor might account for this southward decline?
A) increased intensity of competition B) increased intensity of predation C) increased dispersal distance from the continental source of species
Which of the following causes inflammation of the liver?
A) Salmonella enterica B) Shigella spp. C) hepatitis A virus D) Vibrio cholerae E) Escherichia coli