Which of the following effects may be mediated by transposable elements?
A. Genetic deletions may form.
B. Activation of nearby genes may occur.
C. A mutation may result from insertion into a gene.
D. All of the choices are correct.
Answer: D
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In magnesium-deficient plants the older leaves show more severe symptoms of chlorosis which is a yellowing of the leaves than younger leaves. What is the best explanation?
A. There is more time for the symptoms to develop in older leaves. B. Chlorophyll is transported from the older leaves to the younger leaves. C. Magnesium is more soluble in younger leaves. D. Scarce magnesium is removed from older leaves and translocated to support younger, more active leaves. E. Older leaves need less chlorophyll. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question containand what do they mean? Gather Content · What do you already know about the importance of magnesium in chlorophyll? 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?
Each of the following target bacterial ribosomes, except ________.
A. tetracycline B. polymyxins C. erythromycin D. gentamycin E. streptomycin
In vertebrates, neural crest cells give rise to the nerves, head muscles, and cranium. Indicate whether the statement is true or false
Use of synthetic fertilizers often leads to the contamination of groundwater with nitrates. Nitrate pollution is also a suspected cause of anoxic "dead zones" in the ocean. Which of the following might help reduce nitrate pollution?
A) growing improved crop plants that have nitrogen-fixing enzymes B) adding nitrifying bacteria to the soil C) adding denitrifying bacteria to the soil D) using ammonia instead of nitrate as a fertilizer