Work by Scott Bizily, Richard Meagher, and colleagues in the 1990s produced Arabidopsis thaliana
plants that are able to take up ____ from the soil and convert it into a much less dangerous substance.
a. arsenic
b. methylmercury
c. chelated iron
d. lead
e. uranium hexafluoride
B
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Countercurrent exchange is a mechanism in which two adjacent currents flow in opposite directions and exchange materials. This mechanism can be found in
A. mammals. B. birds. C. fish. D. worms. E. sea anemones.
Which of the following statements is not true concerning the estrogen spike at the end of the follicular phase?
A. It has a positive feedback effect on the pituitary gland. B. It is followed by ovulation. C. It causes a decline in gonadotropin-releasing hormone from the hypothalamus. D. It is followed by a surge of LH. E. It has a positive feedback effect on the hypothalamus.
Which of the following is NOT a reasonable fear of genetically modified foods?
a) Organisms that we want to kill may become invincible. b) Eating genetically modified foods could be dangerous. c) The loss of genetic diversity among crop plants is risky. d) Organisms that we don't want to kill, like the monarch butterfly, may be killed inadvertently. e) All of the above are reasonable fears of genetically modified foods.
Hybrids with chromosomal inversions often have:
a. a doubling of chromosomes. b. superior environmental performance across a cline. c. dysfunctional gametes. d. speciated.