What is the danger of Ug99 to global food production? What will be an ideal response?
ANSWER: Ug99 is a strain of Puccinia graminis that is able to cause wheat stem rust in strains of wheat
previously thought to be resistant. Wheat provides a large fraction of the world's food, and
thus any wheat pathogen is dangerous. What makes P. graminis particularly dangerous is that
its spores can be distributed on the wind over tremendous distances.
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Like all fatty acids, oleic acid is extremely hydrophobic. Why?
a. Because the hydrocarbon tails are charged. b. Because long hydrocarbon tails cannot interact with water. c. Because it has a multi-ringed structure. d. None of the above.
____ epithelial tissue is only one cell layer thick
a. Stratified b. Dense connective c. Loose connective d. Simple e. Cuboidal
Consider the following proposed determining function for a student's grade on the econometrics final, FinalGradei = 68 + 4 HoursStudiedi - 0.5 Num Other Finalsi2 + Ui, where hours studied is the number of hours studied during finals week by student i, and number of other finals squared is the number of other finals student i has during finals week squared. Derive the formula for the change in a student's final grade with respect to a unit change in the number of other finals the student has in finals week.
A. Final Grade increases by 0.5 × (Num Other Finals). B. Final Grade decreases by Num Other Finals. C. Final Grade decreases by 0.5. D. Final Grade increases by 4.
Proper functioning of the human kidney requires considerable active transport of sodium in the kidney tubules. If these active transport mechanisms were to stop completely, how would urine production be affected?
A. A greater-than-normal volume of urine equal in concentration to the blood (isotonic) would be produced. B. A greater-than-normal volume of urine that was more concentrated than the blood (hypertonic) would be produced. C. A lower-than-normal volume of urine which was less concentrated than the blood (hypotonic) would be produced. D. A lower-than-normal volume of urine which was more concentrated than the blood (hypertonic) would be produced. E. No urine would be produced.