A key factor in the high prevalence of otitis media in children is
A) the maturing of the innate and adaptive immune responses in children.
B) the lack of a mature microbiome in the auditory canal.
C) children do not complete their routine vaccine schedule until adolescence.
D) children are more likely to suffer from colds and influenza than adults.
E) the orientation of the eustachian tube in children prevents efficient fluid drainage.
Answer: E
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Trichloroethylene (TCE) is toxic to humans because it
A. depletes nitrogen from soils. B. is carcinogenic. C. contains heavy metals. D. prevents CO2 production by plants. E. causes a decrease in the yield of crop plants.
What would be the most significant, immediate result of a complete collapse of bee colonies across the United States?
a. a decrease in the size and brilliance of commercial flower arrangements b. global shortages of critical honey supplies, and related baked goods c. failure of fruit and vegetable crops that depend on bees for pollination d. a collapse of the insect repellant and fly-swatter industries
A DNA region that can "jump" from one location to another is called a
a. frameshift mutation. b. transposable element. c. mutagen. d. polysome. e. base-pair substitution.
Each of the following is true about plant rosettes except
A) rosettes are localized in the plasma membrane. B) rosettes are cellulose-synthesizing enzyme complexes. C) rosette deposition of cellulose microfibrils is directed by microtubules. D) rosettes move in the plasma membrane to deposit growing cellulose microfibrils. E) rosettes deposit cellulose microfibrils only in the middle lamella.