What is a potential problem with the use of transgenic varieties of plants that contain Bt toxin?
A) Bt toxin may be harmful to humans.
B) Bt toxin may be harmful to some beneficial insects.
C) Transgenic crop varieties with Bt toxin are not very hardy and require a lot of care.
D) Transgenic crop varieties with Bt toxin require large amounts of chemical insecticides to grow.
Answer: B
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Which region is largest in a mammalian brain?
A. cerebral cortex B. brain stem C. cerebellum D. hippocampus
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body. B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported throughout his body. C. The concentration of oxygen would be the same in red blood cells and blood plasma.
The first child conceived using IVF was born in ____
a. 1958 b. 1968 c. 1978 d. 1988 e. 1998
Hominins are characterized by
a. further expansion and elaboration of the brain. b. bipedalism. c. omnivorous feeding behavior. d. further expansion and elaboration of the brain and bipedalism. e. further expansion and elaboration of the brain, bipedalism, and omnivorous feeding behavior.