What would happen if Casparian strips were not present and water and minerals could pass between endodermal cells of the plant root rather than through endodermal cells?
A) An increased concentration gradient of the minerals in the extracellular space of the vascular cylinder would be better maintained.
B) Root hairs would lose their ability to take up minerals.
C) Minerals would leak back out of the extracellular space of the vascular cylinder as fast as they were pumped into it.
D) The minerals would enter the conduction vessels of the vascular cylinder much more rapidly.
E) Too much energy would be needed to move the minerals between endodermal cells.
C
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A frequent symptom of the common cold is
A) nasal discharge. B) fever. C) headache. D) diarrhea.
Familial hypercholesterolemia is a(n) _______ disorder.
Fill in the blank(s) with the appropriate word(s).
Which of the following scenarios would provide the most relevant data on population density?
A) Count the number of nests of a particular species of songbird and multiply this by a factor that extrapolates these data to actual animals. B) Count the number of pine trees in several randomly selected 10-meter-square plots and extrapolate this number to the fraction of the study area these plots represent. C) Use the mark-recapture method to estimate the size of the population. D) Calculate the difference between all of the immigrants and emigrants to see if the population is growing or shrinking. E) Add the number of births and subtract the individuals that die to see if the population's density is increasing or decreasing.
What percentage of the population are children 4 year old and younger in West Africa?
A. 8.5 B. 12 C. 17 D. 23 E. 50