Gel electrophoresis sorts DNA molecules on the basis of their
A) nucleotide sequence.
B) ability to bind to mRNA.
C) solubility in the gel.
D) size.
Answer: D) size.
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Use the following graph and information to answer the question below
Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph below shows the mean dates of arrival, bird hatching, and peak caterpillar season for the years 1980 and 2000. The shift in the peak of caterpillar season is most likely due to _____. A) pesticide use B) earlier migration returns of flycatchers C) an innate change in the biological clock of the caterpillars D) global warming E) acid precipitation in Europe
Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential. ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells. What effect would this have on the stomata and the process of transpiration?
A. The stomata would open thereby increasing the rate of transpiration. B. The stomata would open thereby decreasing the rate of transpiration. C. The stomata would close thereby decreasing the rate of transpiration. D. The stomata would close thereby increasing the rate of transpiration. E. The change in the stomata would have no effect on the rate of transpiration. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the relationship between transpiration and stomata? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following statements about incinerators is FALSE?
A.Incinerators reduce the volume of material that needs to be landfilled. B.Incinerators are expensive to build and operate. C.The burning of waste reduces the toxic and hazardous materials in the waste stream, as the heat neutralizes the toxins. D.Burning solid waste in incinerators can be used to produce energy.
The island of Surtsey, which formed from volcanic eruptions, was first colonized by _____.
A. bacteria and fungi B. lichen C. mosses D. vascular plants E. seagulls