Viruses that are polyhedrons with 20 sides are said to have ________ symmetry.
Fill in the blank(s) with the appropriate word(s).
icosahedral
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Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?
A) incomplete dominance B) multiple alleles C) pleiotropy D) epistasis E) codominance
Which of the following must occur in order to maintain a high pressure potential within guard cells?
A. Potassium ions must be actively transported out. B. Energy must be constantly expended. C. Water must exit guard cells by osmosis. D. Stomata must take up more oxygen and less carbon dioxide. E. The rate of transpiration must increase. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about how guard cells function? How does it relate to the question? Consider Alternatives · What other information is related to the question? Which information is most useful? Choose Strategy · 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?
The size of a plant's seeds reflects an evolutionary trade-off. Large, heavy seeds contain ample nutrients to fuel seedling growth but may not travel far. In contrast, small seeds store limited nutrients but disperse far and wide. Human-cultivated crops typically have larger seeds than do their wild ancestors. How has human farming altered the evolution of these crops?
A. We grow the plants under conditions that favor the growth of larger seeds. B. By using fertilizers, the seeds do not need to store as many nutrients. C. We have created crop plants that are more competitive in the wild than their ancestors. D. Because we spread the seeds, we can spread more smaller seeds per acre, thus favoring these plants. E. We have removed the selection pressure favoring small seed size.
Dengue hemorrhagic fever is the result of
A) an immediate immune reaction to the initial infection with dengue virus. B) an antibody-antigen complex reaction. C) a hyperimmune response to reinfection with dengue virus. D) an autoimmune disease. E) the chronic carrier state associated with dengue virus infection.