Scientists have warned doctors of the danger of their increasing use of antibiotics (for instance, penicillin) for treating minor illnesses. They are concerned because ____________.
A) humans will become tolerant to the effects of drugs
B) excessive use of these drugs leads to a diminished sensitivity to them
C) strains of microorganisms that are resistant to these drugs will be selected
D) the drugs will be metabolized more quickly by our bodies, decreasing their
effectiveness
E) none of these
Ans: C) strains of microorganisms that are resistant to these drugs will be selected
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Many bird wings are more convex on the upper surface than they are on the lower surface. This enables the wing to provide greater lift because
A. A. air moves more slowly over the top surface of the wing than over the lower surface. B. B. air moves more quickly over the top surface of the wing than over the lower surface. C. C. the pressure above the wing is greater than below the wing. D. D. the pressure above the wing is less than below the wing. E. A and C F. B and D G. A and D H. B and C
Typical soils of the temperate forest region are
A) alfisols and inceptisols. B) oxisols. C) andosols. D) aridisols and vertisols.
A type of genetic flow called the founder effect occurs when a small number of individuals from a
large population form a new colony. _________ Indicate whether the statement is true or false.
What structures in an animal's body would be the primary targets of genes for behavior? Check all that apply.
A. kidneys B. lungs C. brain D. muscles E. neurons