Which of the following statements is CORRECT?
a. A hypothesis that does not generate a testable prediction is not useful.
b. Common sense is usually a good substitute for the scientific method when trying to understand the world.
c. It is not necessary to make observations as part of the scientific method.
d. The scientific method can be used only to understand scientific phenomena.
e. All of the above are correct.
Ans: a. A hypothesis that does not generate a testable prediction is not useful.
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
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
The proteins that bind to the DNA near regions where gene transcription begins are called
A) promoter genes. B) homeobox genes. C) mRNA. D) the gray crescent. E) transcription factors.
________ is the enzyme involved in joining nucleotides as they are paired up
Fill in the blank(s) with correct word